Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb7dfd7b0a88f47…

MALICIOUS

PDF

77.4 KB Created: 2021-04-14 13:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b091ae9346b34ea655d765dc6a327ffd SHA-1: 79951dd69e76be08abd1e5d75a82d60ee1f26cc6 SHA-256: 2fb7dfd7b0a88f47e42e9913a43a5c9aab5bf9e5dc43dce6b4f2f9f92a01db90
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are obfuscated or lead to potentially malicious domains, indicating a link farm or distribution mechanism. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=winchester+gun+safe+26+gun+ts26-45+review
    • https://cdn.sqhk.co/wikaraxixi/gc0gg0B/bivitegupofesajoziniwuxe.pdf
    • https://cdn.sqhk.co/dojidavos/6jhWhaL/fivuw.pdf
    • https://cdn.sqhk.co/zakoduba/clZKPih/nursing_dosage_calculation_practice_worksheets_with_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4471082/normal_6060fa5dc42fb.pdf
    • https://cdn-cms.f-static.net/uploads/4368977/normal_603c4162d5546.pdf
    • https://cdn.sqhk.co/futipujorup/Kiajehh/dinosaur_world_kentucky_gift_shop.pdf
    • https://cdn-cms.f-static.net/uploads/4420934/normal_601fc3e5f0dd1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_ecbb2513798142f0b256087709e7439f.pdf?index=true
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_70884413a006433a835e246f5f86ce7d.pdf?index=true
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_4dae9a200b2144568666d280b76b9488.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8503eefb-77fe-4f42-818f-97b0c952c4fb/41330796640.pdf
    • https://uploads.strikinglycdn.com/files/913cebba-2d2d-4a19-81ee-b839f461960e/deathwatch_first_founding_errata.pdf
    • https://uploads.strikinglycdn.com/files/8c59ff42-8f99-4f7f-ac0b-7e5b872e114d/craigslist.org_dayton_ohio.pdf
    • https://uploads.strikinglycdn.com/files/e8b19a68-3053-4d95-90a1-bb304d12a68a/free_printable_1st_grade_worksheets.pdf
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_79dc79696cf24031bbeddf9da57446a6.pdf?index=true
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_fde29b3de9924558acf3f2e1814edf0b.pdf?index=true
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_6b50635e205a449898a206fe72ab65b0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/86a24234-04bd-4c2f-a941-840188dc37c1/advanced_practical_organic_chemistry_john_leonard.pdf
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_0022d79177d84ceb8ec80236fa5c26e2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f759c54d-4c66-4d6c-84e6-e14abe755689/what_are_the_symptoms_of_moolam.pdf
    • https://uploads.strikinglycdn.com/files/18f13885-0338-40ef-a363-5cca65299edf/life_fitness_elliptical_sale.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d8.bin
c308b30b3d299426c98841a4f5a6ef912c3666c66185ccffd4ef901f444c895f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 5808 bytes
font_01_sfnt_off000104cf.bin
4a43d3f475507629122de3bc5982b0edffb0574e86fbdca5394a4d9af06f7670		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 10392 bytes

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