Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b4c6d1c2417b38…

MALICIOUS

PDF

78.2 KB Created: 2021-06-02 21:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 25664d96f5affbddcf59275d3f61fd0d SHA-1: 25eb65051abde7427470282d4e41cc31daaf9e9d SHA-256: b7b4c6d1c2417b38931e4f87c69d35621a71048adc09e843a1cae614fb8ef115
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://mezovuduw.ru/123?utm_term=dark+souls+1+gaping+dragon+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417024/normal_60414800ddc72.pdfIn PDF document text
    • https://sivipamekan.weebly.com/uploads/1/3/2/6/132682587/433974.pdfIn PDF document text
    • https://labaveboto.weebly.com/uploads/1/3/4/6/134611097/4189631.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388611/normal_5fe320ceb3ae3.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/2952270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401538/normal_5fe60bf46044d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477369/normal_5fceee0d5b7c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_60265be25aee6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450864/normal_6000e637672fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486521/normal_5fd33f039226d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446915/normal_60176bc8b6567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419195/normal_5fe915ce9298a.pdfIn PDF document text
    • https://bomovote.weebly.com/uploads/1/3/5/3/135398027/7440805.pdfIn PDF document text
    • https://noloxuxema.weebly.com/uploads/1/3/1/4/131453633/fufavuxuwula-jajitek-wovir-gibizinadep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470016/normal_5fe484b9512e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_6051a314474ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456985/normal_605ca81e4e463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479441/normal_5fd92e3b17535.pdfIn PDF document text
    • https://rojomitalo.weebly.com/uploads/1/3/4/4/134485393/fevepak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393204/normal_600942702028b.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 5240 bytes
SHA-256: 52a0ff4db27794fcdd05cc9a064fe2235d7f05a90b1046c55641c3b296bae98c
font_01_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 10712 bytes
SHA-256: c18740b0e1f1344e3a377bbb4387212aaff39ffbaf34111b446daeb18486d373

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