Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3e83bba8a62d54…

MALICIOUS

PDF

70.5 KB Created: 2021-03-19 17:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd687405fe23f0f3e5aaae23468eb720 SHA-1: d2c1e4c14b748e36b37fd64af5370e901c8c7109 SHA-256: ad3e83bba8a62d54b801c4d38d2ec069413daa159eea752c7a053f977edad2b8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique commonly used in link farm attacks to manipulate search engine results or to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=simplex+4020+spec+sheet
    • https://wufikasokuwomoz.weebly.com/uploads/1/3/4/3/134359410/6571070.pdf
    • https://watuxiso.weebly.com/uploads/1/3/2/7/132740831/felemeniditukogejewo.pdf
    • https://cdn-cms.f-static.net/uploads/4404502/normal_5fe9cbac21486.pdf
    • https://rilobajivevet.weebly.com/uploads/1/3/1/4/131438099/zedisiwonones.pdf
    • https://zoxusikajikad.weebly.com/uploads/1/3/4/8/134851315/verapowujoje_vorokuso.pdf
    • https://cdn-cms.f-static.net/uploads/4502248/normal_601cc0e0181a4.pdf
    • https://tabivivefevevu.weebly.com/uploads/1/3/4/8/134889686/lamavimaru.pdf
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/sinawur.pdf
    • https://kegebexik.weebly.com/uploads/1/3/4/5/134590944/xagegexomokoziv-pakom-ridelibomojej.pdf
    • https://nagopajasire.weebly.com/uploads/1/3/4/3/134311949/5181402.pdf
    • https://regezubigif.weebly.com/uploads/1/3/5/3/135320660/xasunusima.pdf
    • https://dapodufez.weebly.com/uploads/1/3/3/9/133997146/rifojumeni.pdf
    • https://jerumegilaguro.weebly.com/uploads/1/3/0/7/130776399/worejitodo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_ecec41dab0ea4a8d8bf3f3d940fb1366.pdf?index=true
    • https://s3.amazonaws.com/votawawo/drukarka_epson_surecolor_sc-p800__roll_media_adapter.pdf
    • https://s3.amazonaws.com/folexapurilowe/vutigafazifobezazuwane.pdf
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_a39835c2753e4799a24960715576fda8.pdf?index=true
    • https://s3.amazonaws.com/jolituzoji/you_are_the_reason_song_muzmo._ru.pdf
    • https://s3.amazonaws.com/tudawufed/having_you_near_me.pdf
    • https://s3.amazonaws.com/lawakux/55584004276.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_off0000d605.bin
90faf5831f2e6d2e46e7aeb0eebb474436318e63599529294be9ade9d5d4851f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD605 5400 bytes
font_01_sfnt_off0000e852.bin
9838905a9e28953b238f3e5df74306d64ed2135d3fdc851e81cfd2179d5d6a65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE852 10868 bytes

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