Malicious PDF — malware analysis report

Static analysis result for SHA-256 7336b69997a480f4…

MALICIOUS

PDF

68.2 KB Created: 2021-03-31 12:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8409c79f5a9c0d4b4e3a1cdf6c7f6121 SHA-1: 4911b623788673ef7d41d15932d48d8378c08b1f SHA-256: 7336b69997a480f427249aef11a5be2b46fb51c1df6fb2f92add25340cddfa37
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a `utm_term` parameter in one of the URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://vilenefex.ru/strik?utm_term=sisterhood+is+powerful+pdf+download PDF link annotation
    • https://jelonuzekuxenu.weebly.com/uploads/1/3/2/8/132814084/4013545.pdfIn PDF document text
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/66975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_605b046a8f21e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497372/normal_600a5f97c5be7.pdfIn PDF document text
    • https://ruwufinojib.weebly.com/uploads/1/3/4/6/134643146/megonal.pdfIn PDF document text
    • https://bakukiteziz.weebly.com/uploads/1/3/4/8/134860946/bepefejenaj_dolaseba_wukezefopuxib_madodovexo.pdfIn PDF document text
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/punufabevumeb.pdfIn PDF document text
    • https://fofonamid.weebly.com/uploads/1/3/4/8/134869219/1911713.pdfIn PDF document text
    • https://gujinaberukigav.weebly.com/uploads/1/3/1/8/131856979/dazukebuleravu.pdfIn PDF document text
    • https://lesikikonojen.weebly.com/uploads/1/3/0/7/130740189/jalegakokuj-riguvev.pdfIn PDF document text
    • https://zekilunadaxidub.weebly.com/uploads/1/3/4/6/134631079/rutakugiwud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492529/normal_6005bd6c793a5.pdfIn PDF document text
    • https://navolujute.weebly.com/uploads/1/3/1/4/131483334/pozoma.pdfIn PDF document text
    • http://xiruzox.mygamesonline.org/trastorno_esquizofrenia_paranoide.pdfIn PDF document text
    • http://burivuvuju.medianewsonline.com/57468027636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403948/normal_6051349da835f.pdfIn PDF document text
    • https://wusuritod.weebly.com/uploads/1/3/0/7/130739885/5284526.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_3984dd810b2b4c5fba7fdf673505a373.pdf?index=trueIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_6c6210e0087f4d70b160c28121aebfd2.pdf?index=trueIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_5a5549a174e344a48a920766494186d4.pdf?index=trueIn PDF document text
    • https://71fc3d66-43b2-4ae0-adc3-dfbcdf8b5360.filesusr.com/ugd/6605a0_c1ecb564a96747bf9d9bb21c043f3085.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE80 5324 bytes
SHA-256: dfd36f005d63e5a5c4cb35dc5c8c333a0ceb9082454b7383393126ed1677d24d
font_01_sfnt_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 10224 bytes
SHA-256: 5ed829d3047f8177e8c4700da578bb521e68d08c26181ec556d8458df73ecca8