Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3afa4fe1906dab…

MALICIOUS

PDF

72.2 KB Created: 2021-04-07 11:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7a4fde50cf9d767345b0a8b85f045786 SHA-1: 1ceb5d4f44b3023570fe1c2b3677281612ac8221 SHA-256: ec3afa4fe1906dabaef7224b1ca18212cbd914f5afe6397e12601b94333a26e0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with critical heuristics indicating it is part of a PDF link farm. The document body is heavily obfuscated, but the presence of numerous external links, including one to 'nipisod.ru', suggests an attempt to manipulate search engine rankings or redirect users to potentially harmful content. No scripts were extracted, but the overall structure points to SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/123?utm_term=queue+in+data+structure+in+c+pdf PDF link annotation
    • https://tavutapakewig.weebly.com/uploads/1/3/5/3/135399939/c56aee9263eb.pdfIn PDF document text
    • https://vorujefam.weebly.com/uploads/1/3/4/3/134322124/roruvijejafu.pdfIn PDF document text
    • https://falizuzu.weebly.com/uploads/1/3/4/5/134506804/zafutisotukotivoda.pdfIn PDF document text
    • https://xijafidul.weebly.com/uploads/1/3/2/3/132303061/sabew.pdfIn PDF document text
    • https://mewuvonemifutu.weebly.com/uploads/1/3/5/3/135394867/zeponopupivujupivo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/acce4077-b884-4d2e-a8f8-f0a57396a6f5/93778098217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd44f78-d993-4827-9ee5-61ac9d10e4ad/libojamopewo.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_ca677203a98b422fbd7730941b1046ff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52962e5b-b44b-4763-ae54-0a8c5aeade69/how_do_you_start_an_informative_essay.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_b8a679ccd5de43b7bbac33da47edaa55.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a2ffa3-c052-4007-b4ea-bd431990204a/vuvipebusonotix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1073176a-59c1-4343-b648-1b9c7a68d7da/how_to_use_a_blank_check.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19e66e20-1d8f-4322-9cf7-9d5e2e53a6eb/attack_on_titan_season_4_last_episode_release_date.pdfIn PDF document text
    • https://c7ecfb45-4de9-4174-91ae-4a3416e09b0d.filesusr.com/ugd/fc4f66_06398f3dcf954e1ea3bf6a1c283c7810.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44d606c4-0970-449b-b094-3f9acc08ac33/do_lifestraws_work_with_saltwater.pdfIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_a2166bfda77446bcb657730e221d1eb0.pdf?index=trueIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_3e0c298541184232be686f9088a7a954.pdf?index=trueIn PDF document text
    • https://4f640d82-8365-4c22-93d6-dbd3427c3fb0.filesusr.com/ugd/55e8b7_3b01d59e1610495d8a7f0516502545cb.pdf?index=trueIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_2fe6ece5eb1541b186df44fd515247ec.pdf?index=trueIn PDF document text
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_b7fe85127c664587bce9c1eed5a872b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f9bf800-f114-4dd7-97ef-d8aba060d486/38620622342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccc0a1a8-6e78-4721-9ab2-8781a971432c/dewalt_shop_vac_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b03ae67a-e59c-48be-8d54-2e0bd1a9bbd9/89857900197.pdfIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_a1e7689e6fde48009b41907abd430acd.pdf?index=trueIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_1a526e83a3e54bd18ec083e9a58a6334.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_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 5176 bytes
SHA-256: f35190aecfc399507083cd6834fabf748ca254ad7cda0f44f68cded1de74048b
font_01_sfnt_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 10432 bytes
SHA-256: 03970e4ccbd97aebf40aa43f50a2851c7e50521b25fae440f4c965e447a1c19f

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