Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79b95b3e9fc1c9d…

MALICIOUS

PDF

73.1 KB Created: 2021-01-20 23:10:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 732dfb13437fc873b7cce019bc710e26 SHA-1: e67d48d401f1d77fda1e73cbe6aa9e1ef014a168 SHA-256: e79b95b3e9fc1c9d95881cac4cae8b03ee477c1d3a4dd885358cae920a169ce7
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, pointing to other PDF files hosted on various domains. This behavior is characteristic of phishing campaigns or malware distribution, where the goal is to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure suggests an attempt to lure users to external resources.

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://druttle.ru/123?utm_term=non+conservative+forces+have PDF link annotation
    • https://kajugolake.weebly.com/uploads/1/3/0/9/130969904/5f332d1e42d3b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413121/normal_5fbc8a4389d7b.pdfIn PDF document text
    • https://lejimawemo.weebly.com/uploads/1/3/0/7/130739028/gejaxaz.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/gUmiggd/26487375133.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420432/normal_5fce43eb1726a.pdfIn PDF document text
    • https://nujawarasut.weebly.com/uploads/1/3/4/3/134310583/49c565.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/mjdhfG5/ice_scream_3_horror_neighborhood_apk.pdfIn PDF document text
    • https://lemirupuzomive.weebly.com/uploads/1/3/2/8/132814022/lezafemon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423752/normal_5fa49532431f9.pdfIn PDF document text
    • http://feziweninepiv.iblogger.org/92889124595.pdfIn PDF document text
    • https://mojabizozawobe.weebly.com/uploads/1/3/4/6/134699592/nuvorokinad.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/hc3OBjb/86844984007.pdfIn PDF document text
    • https://cdn.sqhk.co/nezerozara/jhaibgi/allegiant_air_stadium_seating_chart.pdfIn PDF document text
    • https://junezafebu.weebly.com/uploads/1/3/0/8/130874287/zijimekafufodaxapu.pdfIn PDF document text
    • https://webunufilijamo.weebly.com/uploads/1/3/4/6/134677486/zewefokevawe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447649/normal_5fc666a1c3ce1.pdfIn PDF document text
    • https://raponomipa.weebly.com/uploads/1/3/2/6/132681826/95bd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383138/normal_5fa14e682af4b.pdfIn PDF document text
    • https://reratedazakowim.weebly.com/uploads/1/3/1/3/131378897/958944.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_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 4964 bytes
SHA-256: a912b70cd8f007a15d2d4908b89f3e6edeb1bbe85a562bcefd784f6d202b6a32
font_01_sfnt_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 11604 bytes
SHA-256: 6aa5280bc75374f4e68cca8365e71864e57eb687a00d748e029aa072f02343c5

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