Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4e4b790966081b…

MALICIOUS

PDF

74.7 KB Created: 2021-03-03 05:17:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0471846d546e2fe4bd121d068efc49f8 SHA-1: eda0d9a80d637204b1fc89383373547fc469b569 SHA-256: 7a4e4b790966081b10438e8a5fabb062f9af99203e19e80408c92e62817a3e59
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('fokemale.ru') and another to a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://fokemale.ru/strik?utm_term=is+lucifer%2527s+brother+an+angel PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474746/normal_5fcf473cd42cb.pdfIn PDF document text
    • http://redpandarecycling.com/31503831874aedyn.pdfIn PDF document text
    • http://nuverlites.online/nupajunowijudumq4gf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500882/normal_6037ffc097183.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469617/normal_600436c028239.pdfIn PDF document text
    • http://samettemiz.xyz/61773716367y9he6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473023/normal_6005e71ac9041.pdfIn PDF document text
    • http://strahauto.website/nodokadova8hdhu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419218/normal_600fb9853d48a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481056/normal_5fe7c3a9234b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xurosuforudev.atwebpages.com/iso_9001_version_2015_audit_checklist_excel.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/38782805839.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_off0000e772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 5256 bytes
SHA-256: 56edbfff955b54a6a20820bf3b43091c360fd6e960afee4b925e079b6da01cb9
font_01_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 10724 bytes
SHA-256: fd12be84d61938c692df61279999a294bc8dfc9797e1064784bbedeb79316141

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