Malicious PDF — malware analysis report

Static analysis result for SHA-256 995a837c945db7fa…

MALICIOUS

PDF

80.5 KB Created: 2021-03-24 11:18:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 926c40405b0e442eca46a59912a5712e SHA-1: ecffa03172a56be51ba4ac43019916fb49789e2d SHA-256: 995a837c945db7fa3589c1e5fe7464ff5c7728b3a35374f8f823242994cdfbf2
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 pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. The embedded URLs are likely used to redirect users to malicious content or phishing sites.

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://druttle.ru/wix?keyword=red+queen+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427086/normal_6024b3426d4c6.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/komizewukamokuvorudadoj.pdfIn PDF document text
    • http://icub.tech/jorge_luis_borges_poems_in_spanishzgjnf.pdfIn PDF document text
    • https://lexifodupep.weebly.com/uploads/1/3/2/7/132712330/lawaziga.pdfIn PDF document text
    • http://sakhavto.ru/satanorujavy7zp6.pdfIn PDF document text
    • http://dipazekonowa.mypressonline.com/army_pay_fixation_chart_2017.pdfIn PDF document text
    • https://wejitefokok.weebly.com/uploads/1/3/1/1/131164199/18b41cc49109e71.pdfIn PDF document text
    • http://trenketo.buzz/psychological_testing_for_adhd_in_adults_online5o41d.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/74853745438.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455380/normal_5ff4102edc92d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371261/normal_5fe5b0a4d808c.pdfIn PDF document text
    • http://basiditdcf.space/96091930866b5bh9.pdfIn PDF document text
    • http://reduslim-italy.site/dafagubiseposipenxmnrs.pdfIn PDF document text
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/nozurupopuzodi.pdfIn PDF document text
    • https://gabinabadebaxir.weebly.com/uploads/1/3/1/4/131408928/99b13f71ce4e.pdfIn PDF document text
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/nijij.pdfIn PDF document text
    • http://kevebofuru.medianewsonline.com/60068142380.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462046/normal_5fc9551a28138.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/dogotuzudanamegu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_774e8e444b4049f7ba64d229da886d0d.pdf?index=trueIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_3cc567ce058043b8a3fa934ac425a023.pdf?index=trueIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_f4a5e57fa1664012884c8f09104bc0e9.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_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 4856 bytes
SHA-256: 013e500664ebe4ffa15eb7f04c96a8e318337d4e798b101ea2d445ca6e20ca3c
font_01_sfnt_off00010813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 13552 bytes
SHA-256: 436f583503be098e8fa2173172631e0d7e82d4abecc6146460b29f63fc8c910f

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