Malicious PDF — malware analysis report

Static analysis result for SHA-256 8234455950ee7dad…

MALICIOUS

PDF

72.6 KB Created: 2021-05-25 00:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfa077c055df98ade7156f5b0e3a2680 SHA-1: a933bc15c283e36c1525ce9d9444966799b4a8c2 SHA-256: 8234455950ee7dadf566aa5776dc326466fc0e790eb8551d1ebaea166d40ea31
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF link farm, suggesting a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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-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://dugedepap.ru/strik?utm_term=if+conditional+type+0+1+2+3+exercises
    • https://generixa.weebly.com/uploads/1/3/5/3/135350481/4361214.pdf
    • https://vexofemefenulo.weebly.com/uploads/1/3/4/5/134594555/6522696.pdf
    • https://fikoroviv.weebly.com/uploads/1/3/0/7/130740338/bizadaleso.pdf
    • https://gulipuzajetag.weebly.com/uploads/1/3/5/3/135397689/02b82ab46866245.pdf
    • https://cdn-cms.f-static.net/uploads/4373520/normal_600de78976d1b.pdf
    • https://xesirizibolaz.weebly.com/uploads/1/3/4/4/134432563/wojosajerotari-gusikaw-varebidozatule-gavowom.pdf
    • https://tiwamufeg.weebly.com/uploads/1/3/1/8/131871705/29c7317aac8.pdf
    • https://diwamelebo.weebly.com/uploads/1/3/4/1/134108813/a07f19f9e55.pdf
    • https://kavivapepegag.weebly.com/uploads/1/3/4/2/134235540/28a7d.pdf
    • https://vonorakukipi.weebly.com/uploads/1/3/4/7/134721252/ripum.pdf
    • https://cdn-cms.f-static.net/uploads/4448746/normal_604618ff41efc.pdf
    • https://cdn-cms.f-static.net/uploads/4468274/normal_6045e9cc686ba.pdf
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/piduxu.pdf
    • https://cdn-cms.f-static.net/uploads/4481509/normal_60475d688ec4b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d7fd616a-9d2d-402a-bf99-5e2b5abe2f35/what_are_the_three_main_purposes_for_writing_and_using_nonfiction_text_structures.pdf
    • https://s3.amazonaws.com/daniwodug/82564231682.pdf
    • https://uploads.strikinglycdn.com/files/84c1855d-9524-4072-ad3b-bea1e58e91e6/ramedunumemevokizisezujis.pdf
    • https://s3.amazonaws.com/sugowubuf/57542753812.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_off0000dd99.bin
d12fe26ef15fecf4e68b113ffac91bbef02da7f2e977b1fc725cdb5e28c948e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD99 5748 bytes
font_01_sfnt_off0000f151.bin
c4b0a9c891fac2ce6305f2e631cd1eca324a896a2de59496c4327bcf068b0cd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 10112 bytes

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