Malicious PDF — malware analysis report

Static analysis result for SHA-256 e500c2fb8e15dd7f…

MALICIOUS

PDF

78.7 KB Created: 2021-04-05 13:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da8683171862137b3b9d9ac267fac57e SHA-1: 6c375184cc5f2360850c5163c43e1f1aa2821d99 SHA-256: e500c2fb8e15dd7ffb8afb2c6806e98d7f960c8fec8cef7db8e2b2981fbcc77c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm designed to redirect users to potentially harmful websites. The document body, though partially corrupted, mentions 'disadvantages of business process outsourcing pdf', which likely serves as a lure to encourage clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/award?keyword=disadvantages+of+business+process+outsourcing+pdf
    • http://pipavinekiga.mywebcommunity.org/learning_electric_guitar_book.pdf
    • https://cdn.sqhk.co/mijajijem/iVGSkic/79793797738.pdf
    • https://cdn.sqhk.co/lawafopugu/B5DiiTT/play_happy_chef_2_online_free.pdf
    • https://cdn.sqhk.co/jopubelo/jeGZghg/pagutosimiwafozikag.pdf
    • http://xemokajoled.medianewsonline.com/84117011091.pdf
    • http://bupitubegedew.getenjoyment.net/86788940302.pdf
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/rokotuw.pdf
    • https://cdn.sqhk.co/fofateze/jgHbRgd/dadiwivukutosusovuxov.pdf
    • https://zufesuvagudinaf.weebly.com/uploads/1/3/4/3/134321689/6e5c4.pdf
    • https://nupuwumot.weebly.com/uploads/1/3/5/3/135305030/2062034.pdf
    • https://radisowe.weebly.com/uploads/1/3/4/3/134366404/bc58c840551.pdf
    • https://cdn.sqhk.co/supekolev/eiiji9u/betupakirojipafa.pdf
    • http://zevewidojodot.mywebcommunity.org/vupasuroxunoseti.pdf
    • http://desawigoxikugaw.mywebcommunity.org/vesafafiwo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nunetam.epizy.com/arithmetic_reasoning_and_analytical_thinking_questions_and_answers.pdf
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_f9f91c72f4b04053843051e0fc4c453c.pdf?index=true
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_3e60b9a1711244deb9cce7641128a0ce.pdf?index=true
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_6636d7be05a64519aa34ea07975dc097.pdf?index=true
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_0d4e1df684a749d4b5158de15428e83f.pdf?index=true
    • http://nekanonesogur.rf.gd/likorodepilu.pdf
    • https://37459de8-d961-4a2a-897a-801dad55dcfc.filesusr.com/ugd/1395e2_5c9dc4331fc84dcabb98f85c61bb2e2e.pdf?index=true
    • https://801a9f91-e12c-4b3a-b535-42c3eaff61c8.filesusr.com/ugd/d237ef_2dec82c270714908beaa69ef6cbfecdd.pdf?index=true
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_e04c46f7d51b41559636a33c60e4899b.pdf?index=true
    • https://d6bf9bfb-c092-4b17-ab9f-91da83e6a9d2.filesusr.com/ugd/d7ad14_71ef7f9408a240c5a98897692a589278.pdf?index=true
    • 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_off0000f626.bin
dd57cd1f11399f95719c38c16e192832d77b07c1d52cf98f5186b3aa63d01b8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 5492 bytes
font_01_sfnt_off000108f4.bin
ab816b0e699224580db2fbe22c8f02c4342dceb2ba28188a81ab5bb797fa04c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 10496 bytes

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