Malicious PDF — malware analysis report

Static analysis result for SHA-256 987a019394de5ac2…

MALICIOUS

PDF

100.7 KB Created: 2021-06-02 07:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfcfbcb93e703f1edae8691319d14f11 SHA-1: ac5813511fcf4b43a5d02f7b65874cc65a5e891e SHA-256: 987a019394de5ac2e88071976d71b56639ab93941ead7195933eb6f503fc83ed
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 pointing to PDF files hosted on link farm domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive URL farm point towards an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://smidgel.ru/pbw?utm_term=genel+kimya+1+vize+sorular%25C4%25B1+ve+%25C3%25A7%25C3%25B6z%25C3%25BCmleri
    • https://static.s123-cdn-static-d.com/uploads/4382004/normal_60afea6b4009a.pdf
    • https://fuxiwuzepideka.weebly.com/uploads/1/3/1/3/131381491/xupegopojamamus.pdf
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/tezeburoborox.pdf
    • https://sasogobol.weebly.com/uploads/1/3/4/3/134387633/kalosazowivaroxugom.pdf
    • https://sobokiza.weebly.com/uploads/1/3/4/3/134363786/7651762.pdf
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/nezipixe.pdf
    • https://suxaposalepet.weebly.com/uploads/1/3/4/6/134677753/6473107.pdf
    • https://bidubemawekewar.weebly.com/uploads/1/3/0/8/130815124/7913443.pdf
    • https://zavadogo.weebly.com/uploads/1/3/4/3/134325895/jepemelizovu-gunazemozeko.pdf
    • https://cdn-cms.f-static.net/uploads/4451021/normal_60488d395ccd9.pdf
    • https://rulafusojuxibaw.weebly.com/uploads/1/3/4/2/134265871/kobegelupiwura-bajosivosoj-gesonijevusotep-vufivigibuj.pdf
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/00b707058a4ec2.pdf
    • https://xarojitoma.weebly.com/uploads/1/3/5/3/135305856/gedorokijivixemu.pdf
    • https://rixotojar.weebly.com/uploads/1/3/0/9/130969533/3455437.pdf
    • https://luwigemo.weebly.com/uploads/1/3/4/5/134597726/7232723.pdf
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/kibuliro_wonenaneb_saposevada_lemuraguxupagik.pdf
    • https://cdn-cms.f-static.net/uploads/4490141/normal_6040afa54e782.pdf
    • https://didowaxa.weebly.com/uploads/1/3/4/3/134387091/8406327.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/67dfc716-3d36-4ffe-a86d-505954bbf3fb/43559651864.pdf
    • https://uploads.strikinglycdn.com/files/826bec23-d42d-4698-814d-86105f07bafb/craftsman_air_compressor_33_gallon_parts.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f04.bin
3b930ed36d43684e16267befba592934136d7c5fab348c80b161adc8408a6f62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F04 5664 bytes
font_01_sfnt_off000141d5.bin
6d948b3393f0715935ae75c6a288525f3512fbf73a1734aef60ff44751bded9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141D5 14432 bytes
font_02_sfnt_off00016d27.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D27 16204 bytes

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