Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d103f8ca7a02cf…

MALICIOUS

PDF

78.4 KB Created: 2021-01-01 06:18:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 261bbd1ec7525366e58e9f5698562c2d SHA-1: d5f1c130b12daca09c3f3d558ef9a8ec16378dc2 SHA-256: 09d103f8ca7a02cfb245c61b5a856b986435786a2994da804ed282f628eaa88e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffnew.ru/123?utm_term=cycles+of+matter+worksheet+answers+pdf
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/89d06d0133.pdf
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/fe73f968e0726.pdf
    • https://tukumexof.weebly.com/uploads/1/3/4/7/134721389/9a353.pdf
    • https://rakevuxex.weebly.com/uploads/1/3/4/0/134040666/9f8705.pdf
    • https://bijoxopibomer.weebly.com/uploads/1/3/4/3/134325560/2540516.pdf
    • https://cdn-cms.f-static.net/uploads/4473654/normal_5fd2d2c177481.pdf
    • https://pasojonili.weebly.com/uploads/1/3/4/1/134108831/tesuvu-vovavi-bexipudumukerur.pdf
    • https://jimamejovegevag.weebly.com/uploads/1/3/4/5/134593921/mewel_tuvubu_kawezuvu_wuvoxor.pdf
    • https://nupotilevalodo.weebly.com/uploads/1/3/4/3/134307307/ff3e09178846b7.pdf
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5fe64c4239c8a.pdf
    • https://cdn-cms.f-static.net/uploads/4379038/normal_5f90eb9b43638.pdf
    • https://kojemugolipoxo.weebly.com/uploads/1/3/4/7/134729864/6331701.pdf
    • https://vidiguwases.weebly.com/uploads/1/3/4/3/134347373/dagenupi_pinekum_wasilun_vejulilo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vuzotisenixava/filmora_intro_template_18.pdf
    • https://s3.amazonaws.com/xenavuxa/30960115266.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_off0000f4de.bin
8ac12be7919bb67c7eac69a98cd728f330622d43cd01c0bde9386012af7a7edb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 5560 bytes
font_01_sfnt_off000107b3.bin
e211870f8b632171ffc29304c654dcdb34d2bfb749e1f927738be6320edf453a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B3 10756 bytes

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