Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a0f935ff7c494d…

MALICIOUS

PDF

79.7 KB Created: 2021-03-05 11:01:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2f37e685482308330a6c612909d27e16 SHA-1: 755299830c78c57c34d83d468a871394cb1e36f6 SHA-256: 85a0f935ff7c494d8c9c40d58f83c7c15582d34ba7dd499e82ee82c28cbc8343
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting an attempt to direct users to malicious content or phishing sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm indicate a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=what+are+reactive+strategies+in+aba PDF link annotation
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/3272534.pdfIn PDF document text
    • https://kafaziwe.weebly.com/uploads/1/3/1/0/131070109/nomagasotafilo.pdfIn PDF document text
    • https://binolopokam.weebly.com/uploads/1/3/1/4/131484395/4ef03a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_1ba14932960140dbbf24aa4cd6d4c964.pdf?index=trueIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_96e9d08e928142ba9e91e015edf69e84.pdf?index=trueIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_3ace3f1d9cdb46c69379e76e68f96339.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4b9ac77-f6f9-4fec-8cea-e61d7361fa39/varivalituresutasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c165ca25-cfc4-450e-bd41-f5e8fce72fe4/electrical_engineering_jobs_in_singapore_for_indian_freshers.pdfIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_05f06a1661c941f5a121445e7e923546.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b006ea-58df-4856-9669-d4006a982d55/roninefeboserorirufa.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/28401407989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1953b360-ffad-475c-b365-539a2cfb9f01/pasulorobana.pdfIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_fec5ff372aa94771967f6c1bcbf365b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c53441b-590a-4f31-ada7-68c7bdea4d55/walenejikuvurilowusesul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ac55acd-4ff1-4eaf-bae4-13bc64eb15ee/how_to_build_a_truss_bridge_with_popsicle_sticks.pdfIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_082dfadd30c14de2be278d61e2234031.pdf?index=trueIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_6d0cc71f840d4442885149fb7f8c3b6f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/769b6d87-395f-47dd-8233-3aa2dfae9910/focusrite_scarlett_2i2_gen_2_studio_pack.pdfIn PDF document text
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_ddfe7f2b5ac144679c4b5dd749d427d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/learn_arabic_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd4046fd-c442-4370-aa94-1b659e427b19/19895905187.pdfIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_269ade44fdfc466cb3daed8df17f28a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d6317d7-942d-4ab2-a378-ba6e53bae928/rock_band_4_guitar_wont_connect_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e17774-3f6f-48b4-ba3f-f02551603262/36844036078.pdfIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_4951db91943b426486ef0d29f7c08d8c.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 5244 bytes
SHA-256: 67a4f3894d90b9d7a03550be6367eaad96f5961cc9e790b307a707040f9b882c
font_01_sfnt_off00010b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5E 10960 bytes
SHA-256: eb7379d4ecb24ec4d72dd02f423c5b6e7ac10a3c989ecad625ef43377fba3730

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