Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8a6a06771350d7…

MALICIOUS

PDF

71.6 KB Created: 2021-02-19 09:58:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: babfec1d6e2f9eb2da52c99049d1792d SHA-1: d356120ebb83581f7a833d508610dd8d60180d91 SHA-256: 1a8a6a06771350d75738eb303ceba4b78d1e8ed3461e4441a8a7d51a0362b1c4
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting and a known malicious redirector, indicating a phishing or malware distribution attempt. Although no scripts were extracted, the presence of many links suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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://yafferge.ru/strik?utm_term=modelos+de+comunicaciones In PDF document text
    • https://sijudunewofas.weebly.com/uploads/1/3/4/6/134696620/nijoruran.pdfIn PDF document text
    • https://feditesar.weebly.com/uploads/1/3/1/4/131483001/4c2cc845abb1.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/jb8qSmX/feist_1234_song_meaning.pdfIn PDF document text
    • https://remofixar.weebly.com/uploads/1/3/0/7/130776049/8138333.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391015/normal_5fef9c373cb4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473622/normal_6005260809a90.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/4315264.pdfIn PDF document text
    • https://gazezujebek.weebly.com/uploads/1/3/4/8/134881616/367229.pdfIn PDF document text
    • https://gisonegeviwobi.weebly.com/uploads/1/3/1/3/131383673/pitideruban-moxusodapaboli.pdfIn PDF document text
    • https://teguvazotumeli.weebly.com/uploads/1/3/4/0/134041540/4af117fb175ba69.pdfIn PDF document text
    • https://pusiruse.weebly.com/uploads/1/3/4/7/134717846/3179521.pdfIn PDF document text
    • https://zinorenote.weebly.com/uploads/1/3/5/3/135349773/gutim.pdfIn PDF document text
    • https://cdn.sqhk.co/tofatuxurejo/hdhggen/64804530139.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/wefadep/armorer_guide_ffxiv.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/80168850885.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/udemy_android_app_development_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/fallout_76_enclave_questionnaire_answers.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3F 4996 bytes
SHA-256: afb12ab37d3345dba552b0b16016f009fc191dc3f931bdd728499d4ffaa22415
font_01_sfnt_off0000eb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 11340 bytes
SHA-256: 410da6d76a604f5f6847de150eec7fc3de23a6a50d32f02d33cd01ece081f49f

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