Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b750b9f5aae1f72…

MALICIOUS

PDF

78.9 KB Created: 2021-05-04 07:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcedd758e4d90d972e5a8fff453d3c33 SHA-1: 72cd9143ac56f57494010e408a7c07703603c948 SHA-256: 5b750b9f5aae1f723131359e5427a3b7a0d62398330cd61438425070222a243b
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 point to suspicious domains, suggesting a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ponafet.ru/strik?utm_term=how+to+write+a+news+headline
    • https://cdn-cms.f-static.net/uploads/4417123/normal_60397d3708da8.pdf
    • https://cdn-cms.f-static.net/uploads/4444885/normal_60491afdf1c33.pdf
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/04427b9f2.pdf
    • http://itawegan.fun/pulipegalojamikefozinaryycwb.pdf
    • http://in-step.shop/formato_para_carta_poder_en_wordf1ktz.pdf
    • https://kobenavu.weebly.com/uploads/1/3/4/7/134714827/xideviwubolatan.pdf
    • https://cdn-cms.f-static.net/uploads/4392661/normal_6017887aa3efb.pdf
    • https://xevefozivoro.weebly.com/uploads/1/3/5/3/135339272/vafewu.pdf
    • https://todolomakesawad.weebly.com/uploads/1/3/4/4/134479917/a1bea0b081e6262.pdf
    • https://cdn-cms.f-static.net/uploads/4473963/normal_605bb4c0084c0.pdf
    • https://cdn-cms.f-static.net/uploads/4366358/normal_60177980e13e4.pdf
    • http://instup.xyz/simple_balance_sheet_practice_problems_with_answersf9np4.pdf
    • https://ridakikasidom.weebly.com/uploads/1/3/0/7/130739592/68c8861.pdf
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/lutasepu-posabojiregu-sekopoku.pdf
    • https://cdn-cms.f-static.net/uploads/4475875/normal_5fe80866bc7a4.pdf
    • https://kominalekawer.weebly.com/uploads/1/3/1/6/131636772/2293731.pdf
    • https://xufiridib.weebly.com/uploads/1/3/5/3/135346556/3206690.pdf
    • https://cdn-cms.f-static.net/uploads/4415304/normal_604cdd880eb0b.pdf
    • https://cdn-cms.f-static.net/uploads/4387229/normal_606dced8b1bcd.pdf
    • https://cdn-cms.f-static.net/uploads/4374199/normal_6067a00b158da.pdf
    • http://numberoone.xyz/16292207493q640c.pdf
    • https://cdn-cms.f-static.net/uploads/4422637/normal_602ff856b9faa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jivala/builders_workshop_android_1._3.pdf
    • https://s3.amazonaws.com/xomudufe/adobe_photoshop_cc_apk.pdf
    • https://s3.amazonaws.com/tobito/39390087359.pdf
    • https://s3.amazonaws.com/toguvaju/hedda_gabler_play_guide.pdf
    • https://s3.amazonaws.com/dukexajuj/28337926088.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_off0000f622.bin
0cfad2d603ee941d4a5d68df522c83c8feb6549e19e4f5e42162faab0bbbae61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 4964 bytes
font_01_sfnt_off00010703.bin
6f2c286c204a5575f9859a9d5a026077d3f66de2c4c83a48f13dd230a4ccf3e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 11088 bytes

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