Malicious PDF — malware analysis report

Static analysis result for SHA-256 719c0fa51fc92c9d…

MALICIOUS

PDF

78.1 KB Created: 2021-02-15 05:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3475ca32f1516fe8895c0305b079488e SHA-1: cce17781090b5613c41019efa19a5d39b5ceb573 SHA-256: 719c0fa51fc92c9db542c86a07625f6497b9e561c99c145b126377f1b12246c4
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links pointing to potentially disposable domains, suggesting a malicious intent to drive traffic or distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious content.

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://druttle.ru/wix?keyword=max+lucado+fearless+bible+study+pdf PDF link annotation
    • http://wordsideget.top/constitution_day_worksheets_3rd_gradeglpo3.pdfIn PDF document text
    • https://lesikikonojen.weebly.com/uploads/1/3/0/7/130740189/kegudaxuposanikupebi.pdfIn PDF document text
    • http://belldiscount.ru/fobixomuwh9ewj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_6029d4456afae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379732/normal_60044f2153174.pdfIn PDF document text
    • https://gedofulijul.weebly.com/uploads/1/3/0/7/130775434/nukizigipabixameri.pdfIn PDF document text
    • http://shop-you.xyz/xevusizugitewimajsoekl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490121/normal_600f03be8acd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466676/normal_601df3987dcdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452593/normal_601b002a7468c.pdfIn PDF document text
    • https://goxadivitekoze.weebly.com/uploads/1/3/1/4/131437736/farogogodusawu-rejovasep-noben-kogizojus.pdfIn PDF document text
    • https://linajijokib.weebly.com/uploads/1/3/4/0/134000065/pivejozizerarodaba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463788/normal_5ff03acc70e67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479213/normal_5fcd4268dcffe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nidexivoji.epizy.com/51257311425.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FF 5240 bytes
SHA-256: ba42fc6b2b652fe0b3521aa312937a20b9090c163a309c54e9e796600b02b91f
font_01_sfnt_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 10252 bytes
SHA-256: 75e242e3ec1da22116efd438599b852862dd804f346f4f7a12f69fe6aa92ebc8
font_02_sfnt_off00011cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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