Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdbe7984b84b0e0…

MALICIOUS

PDF

68.4 KB Created: 2020-11-25 19:54:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0c72bd19ce88ed5d1370a154fe76186c SHA-1: 7fb6983cb39db37ec9acb120abab8ceb79bb68fd SHA-256: 7fdbe7984b84b0e03833f72eecc762d9a2e2b2744e4abf2185880b0a5520acf5
264 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDFs hosted on disposable domains, indicating a link farm or SEO manipulation scheme. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ggtraff.ru/strik?utm_term=flammable+materials+cabinet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5f8da0e8e0511.pdfIn PDF document text
    • https://juzatimeb.weebly.com/uploads/1/3/4/6/134605854/7538a3a95a96.pdfIn PDF document text
    • https://wefigofotagovir.weebly.com/uploads/1/3/4/8/134864379/e3e1d.pdfIn PDF document text
    • https://naletonuve.weebly.com/uploads/1/3/4/3/134381452/ditosojuzadasetedok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f8ba4171d90e.pdfIn PDF document text
    • https://garupiripo.weebly.com/uploads/1/3/4/3/134386314/siwugupo_radufiwobisenin.pdfIn PDF document text
    • https://mivosubewo.weebly.com/uploads/1/3/1/4/131407796/4599922.pdfIn PDF document text
    • https://totapige.weebly.com/uploads/1/3/1/4/131483287/barujanuzefawuwip.pdfIn PDF document text
    • https://muropezevoride.weebly.com/uploads/1/3/4/5/134514904/9382013.pdfIn PDF document text
    • https://widobane.weebly.com/uploads/1/3/4/3/134340358/4235711.pdfIn PDF document text
    • https://zisowuwaxafo.weebly.com/uploads/1/3/4/7/134700917/gupupupozibepi.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/xuxovazovis.pdfIn PDF document text
    • https://zewobukepefew.weebly.com/uploads/1/3/4/4/134485556/dudotur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD048 5040 bytes
SHA-256: b76ea79c23d21bba2fa0392545bea48d1f03a3df5155619769d0fa7fb5686081
font_01_sfnt_off0000e153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 10408 bytes
SHA-256: 46b3ec03602330213bce5b828028206f3cc2effdce8b65a9a3333848bdc3b0c8

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