Malicious PDF — malware analysis report

Static analysis result for SHA-256 897f885e00ec5306…

MALICIOUS

PDF

84.9 KB Created: 2021-03-26 09:15:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f24adfa39fd99bad219cab32a6972876 SHA-1: 2053eebac0ae411826312b91cb1d20947d02e989 SHA-256: 897f885e00ec5306e6221a05201af3cd947886bf3e0b1dbdbd157b2b788f04f5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs that redirect to various websites, including a suspicious domain (xajibur.ru). The presence of many links and the use of disposable hosting suggest an attempt to manipulate search engine results or direct users to potentially harmful content, aligning with phishing or SEO-based malicious schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xajibur.ru/123?utm_term=android+auto+stereo+for+kia+soul PDF link annotation
    • https://cdn.sqhk.co/zijikunu/dXiia5k/21522704539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373985/normal_6058ca880dc44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_6041b364c38e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452626/normal_5ff83017bbe57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450502/normal_60551bb781578.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417824/normal_5ff03ce6deaaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451970/normal_5ff0ea6e617ba.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/iiduSRW/9430550481.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/baf35f56-16fe-4966-adf5-1e5fd6789844/how_to_write_a_crime_fiction_short_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/863f6330-6c43-472d-b705-253a834612fa/the_girl_with_the_dragon_tattoo_trilogy_order_of_movies.pdfIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_fcda028c83384f7caeae35687847f176.pdf?index=trueIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_95cfd3fb72bb46bf803909356ca3b240.pdf?index=trueIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_ffc454790a094619a0f247fc4b2987dd.pdf?index=trueIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_9534a19af31b42368961a7d7882c0556.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1815951b-6c77-4232-bae0-cac86ec66f61/tipuwupi.pdfIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_4cbb54b3dc544420b5fa2d7da24ba6ff.pdf?index=trueIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_4f397c1a388e4ef99612541318905525.pdf?index=trueIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_8c43f25e6fcf459c85d84161060ea919.pdf?index=trueIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_e8f15cf48ac6471a9b49e9577e4195a9.pdf?index=trueIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_51ed5271eb634527a7672d9659afcb73.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79d26088-a287-4c94-a0d7-13cb92eaf380/ap_style_percent_in_headlines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb6a29f-4fad-4411-ae33-3fdae0ef8aee/how_to_clean_hp_7520_printhead.pdfIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_abd9c63f04ea439497885d50a4f33b2f.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 4836 bytes
SHA-256: feb2f3a529491b20e72d476909f2fe6073808d77963ea4909082f3d0c09aadbb
font_01_sfnt_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 11948 bytes
SHA-256: ae7db034be997db2168677984d02c842a7463d6362f05e5c6bd8b023b9edcee6
font_02_sfnt_off000120e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 16144 bytes
SHA-256: 7c46bdd5995085f1b667db334183647021a114cb1e9de6240a6a2392c095f0cc
font_03_sfnt_off000135b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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