Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4aca8c39357ed5…

MALICIOUS

PDF

67.8 KB Created: 2020-11-27 20:34:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7d7f35ac7701c55a51d27987707a49c4 SHA-1: d986f1f0120f3cd49fbb6e19abb014061babed7b SHA-256: 4b4aca8c39357ed566724a266673ece18685353f401522e1dc824103fcbf8225
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 5

  • 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://traffset.ru/strik?utm_term=professionalism+in+nursing+articles PDF link annotation
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/c859f5b783344fe.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/nilurivepabedax.pdfIn PDF document text
    • https://gemigefe.weebly.com/uploads/1/3/4/6/134602098/jesis.pdfIn PDF document text
    • https://zatafepe.weebly.com/uploads/1/3/4/0/134000007/3016790.pdfIn PDF document text
    • https://detosujedeke.weebly.com/uploads/1/3/4/3/134371576/sagotal.pdfIn PDF document text
    • https://bobilomagavakux.weebly.com/uploads/1/3/4/8/134868487/7439868.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/setolipojoronanavixo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465930/normal_5fb034cb6ad1d.pdfIn PDF document text
    • https://refiraledekire.weebly.com/uploads/1/3/4/7/134715744/gomel.pdfIn PDF document text
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/gidonef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b205f13b-a8a5-4b9b-9e8f-29e88b1ffd0b/260555273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7201b8bd-3b8f-4440-9b70-3899e64a7652/96618123295.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c3a60e-42d1-499e-ab45-8c2410f8ceff/88741278030.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

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_off0000cdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBD 5204 bytes
SHA-256: ff9004e90877384013f9f9c282aedd5bf9ea7e4bbc215d40cdce43052edb9637
font_01_sfnt_off0000df5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 10256 bytes
SHA-256: e7f80c45837a6a59865e0a640ff1d1d4052a01fb04e17a6120500b66001aea70

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