Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04a79bd1a5b49f6…

MALICIOUS

PDF

83.3 KB Created: 2021-04-16 21:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1fa5c971525b2378537c9a16cef10546 SHA-1: be06a5b43886b45e0a7410642263452163fb27cc SHA-256: f04a79bd1a5b49f6babb6916ac577501de98bd9d39931cdac7bb11a86f76214f
186 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. It contains a link farm with numerous external URLs, including one pointing to 'pelibifir.ru', which is likely part of a phishing or malware distribution scheme. The presence of embedded links and the overall structure suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/strik?utm_term=kobalt+10+inch+miter+saw+blade PDF link annotation
    • 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://5ec50ee2-6c76-415b-b731-82d7de26534b.filesusr.com/ugd/826e74_e55adc3b890b46d69f0a693be1de0cc6.pdf?index=trueIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_215e646869fa45a6acabdbb41a52e740.pdf?index=trueIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_e89aeffb5e62461aadf1cfca61c52f11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f20c02-b010-479e-84a3-1abceebb2050/38019500578.pdfIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_901f2e2d65a34b278fd4706f307bb28c.pdf?index=trueIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_f93c3a23655a4ae29a2c84bdd1916c4b.pdf?index=trueIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_76ca3e60d0ce4dd487ca394a996e0c1e.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_31cfea49559f4c72b95b19a30b15ce19.pdf?index=trueIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_f3c6ed215cb44d5dbd8b34018dac2170.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d703e05-7d5f-4669-a301-2b04fc5ab207/i_am_enough_grace_byers_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f61a836-3b10-4283-95a1-f45c6fc2b478/38802125086.pdfIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_784ccf4a531e4a9fb0a342b7bd1ade03.pdf?index=trueIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_0092c68916614d09adfa40725a057c16.pdf?index=trueIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_44e85c487b824e16b684ce69b859a0c2.pdf?index=trueIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_ea19c9642732401da5c4fd99f6159935.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/952f026b-68f1-454e-9f46-85cef6eb7b84/varukakiwiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/142ad546-de9d-4cf3-9c76-59f83d538dbd/dilisururupaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f97cf9-cf87-4673-ae9a-f41ff7b4b4be/97750357529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bc4d709-dd72-4d8e-a9f4-6573d6164bcb/52059202232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feda6c3b-9d76-43a5-9e0e-ca7b562cd2aa/caterpillar_3126_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad0575a4-ef7e-43d8-8604-c03f808cecd8/review_laptop_lenovo_thinkpad_t420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce8e508d-3f8f-4221-896b-75b402149cda/honda_lawn_mower_repairs_melbourne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dfc6202-bce9-4148-b97a-649bddb8697a/diary_of_a_wimpy_kid_rodrick_rules_book_climax.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 5364 bytes
SHA-256: 3c9bea400d9c0d84aa54c09833a2aae999a8e9fb272a2dbc0856f07b0d7f453e
font_01_sfnt_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 10728 bytes
SHA-256: a04702ff44f5ab20761f78389ebdfed24deaf31dd7a0f9980a57b35f6c0cae48
font_02_sfnt_off000131c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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