Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2e79d37037a821…

MALICIOUS

PDF

87.8 KB Created: 2021-02-23 10:09:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bcda10516f954e4410aa0196df59697d SHA-1: d07651099951064e91730dd3c73ed189526dda7f SHA-256: 3b2e79d37037a821496d9c711f01afb1ef1a2c0ab1a9c32b4e36278ff636ff05
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are on disposable hosting, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV both flagged the PDF as malicious, with ClamAV specifically identifying it as a phishing trojan. The embedded URLs likely lead to malicious content or phishing pages, and the document body's obfuscated nature further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=diary+of+a+wimpy+kid+books+reading+level PDF link annotation
    • https://cdn.sqhk.co/beledufe/hfjV8ib/world_war_2_gameplay.pdfIn PDF document text
    • http://itravelimpressions.com/nadisifonuzifesitub4i2g7.pdfIn PDF document text
    • http://ladyso.ru/jubinolomozulixafibejkz8h.pdfIn PDF document text
    • https://cdn.sqhk.co/gidulikegel/dLURKHF/wixokaropoxogizarotepevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414339/normal_602cea2b13b85.pdfIn PDF document text
    • https://vezikiga.weebly.com/uploads/1/3/0/7/130739663/bomib.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/gjeghhg/21336219591.pdfIn PDF document text
    • http://zarabotok.space/debulabunutijozupagawivotqm58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490519/normal_60218edc8842c.pdfIn PDF document text
    • https://dezirivudamowi.weebly.com/uploads/1/3/1/8/131856369/gesox_wuwutuduxokunev_dasapo.pdfIn PDF document text
    • https://cdn.sqhk.co/fupupusamun/bii62ja/nibuzikel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464870/normal_5ffce0a188b4f.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/bP3zala/kapuxedawakenagadeg.pdfIn PDF document text
    • https://xuvivodoxanujo.weebly.com/uploads/1/3/5/3/135308848/a4a60.pdfIn PDF document text
    • http://ribupisid.22web.org/build_your_english_vocabulary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497697/normal_5fcc04b83ddc6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bixoravu.epizy.com/jenetovagoke.pdfIn PDF document text
    • http://fukibas.epizy.com/household_expense_list_template.pdfIn 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_off000117fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FB 5820 bytes
SHA-256: c4ddbd5197fff5042f8746a06e5656516e63b7460f7af56cb8961cefb2a9e92a
font_01_sfnt_off00012bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDB 11348 bytes
SHA-256: 459ba0ce27b7ae3186c523e88f43ffd90546721f6caa0f010d93c3cbdaa4c6eb

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