Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96456c1e8709dde…

MALICIOUS

PDF

75.0 KB Created: 2020-12-04 08:15:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ef780ef401369be8d54848bf117c0813 SHA-1: 72ac13cbbecf6021158f2b129e06ce50bad74c6a SHA-256: b96456c1e8709ddebad37181b6e83cb39932c6157863e8981a3cf5e13c5d2d12
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure. The primary malicious URL identified is 'https://traffmen.ru/strik?utm_term=five+good+emperors+book', which is flagged as a malicious redirector. The file's structure and numerous links suggest it's designed to lead users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9776

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://traffmen.ru/strik?utm_term=five+good+emperors+book In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413696/normal_5fb0436165220.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413110/normal_5fc4a962b054d.pdfIn PDF document text
    • https://fodolazaso.weebly.com/uploads/1/3/4/8/134891373/4220987.pdfIn PDF document text
    • https://kilesikawagex.weebly.com/uploads/1/3/4/3/134372597/966e73e6bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5f91a9e2c3e9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_5fad4127103ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388815/normal_5f9a37781184e.pdfIn PDF document text
    • https://waniremupamed.weebly.com/uploads/1/3/1/4/131407535/7bff00e210f9f.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/wupozowefunalenem.pdfIn PDF document text
    • https://nagugopusoz.weebly.com/uploads/1/3/4/6/134645600/wapenuga.pdfIn PDF document text
    • https://sevanilab.weebly.com/uploads/1/3/1/4/131437268/tosapagoruxisojovi.pdfIn PDF document text
    • https://dibekojiworibo.weebly.com/uploads/1/3/1/6/131637919/refufosaru_fodopobuf_duvusesex_banaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/54398377352.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/northwest_coast_food_images.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/mufelijuz.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/2018-_19_nfhs_basketball_rules_book.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/medicamentos_antipireticos_lista.pdfIn 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_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 5256 bytes
SHA-256: 8e7cc58bc8a7ab8594190a6dc644c08f8458bc9dbb251b59409ee58a57cbc813
font_01_sfnt_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 10380 bytes
SHA-256: f93c2b11b0e957cd39dfb7471a43d84e62a71ae93d2774205a1757131649061b

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