Malicious PDF — malware analysis report

Static analysis result for SHA-256 767a6904a205deee…

MALICIOUS

PDF

80.0 KB Created: 2021-02-28 14:45:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d9065543ae63c03eabacbbefe014d339 SHA-1: 194ba8dc332589248db77178bbeae1d769677cad SHA-256: 767a6904a205deeeddf0eb24bb11fd9eb21a3197e39911485ff4782ad08b74e9
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards an attack pattern involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=vietnam+war+timeline+worksheet PDF link annotation
    • http://dotavulilego.mypressonline.com/42712918094.pdfIn PDF document text
    • https://metidesu.weebly.com/uploads/1/3/4/4/134492072/8164468d0f.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/74866102597.pdfIn PDF document text
    • http://confirmationhelpcenter.com/131009506194fraw.pdfIn PDF document text
    • https://lukidamovepuk.weebly.com/uploads/1/3/1/4/131437538/gafafav-guzefebowunija-towudexe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384634/normal_6009b77268f4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388279/normal_603210030a4dd.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/10194871525.pdfIn PDF document text
    • http://harkateine.fun/alien_shooter_ios_freei1ykc.pdfIn PDF document text
    • https://vepemetamat.weebly.com/uploads/1/3/4/3/134354227/xikogerita.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470703/normal_5ff62b6fdff27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464078/normal_60170ce9f40cb.pdfIn PDF document text
    • http://criticcxck.space/679390523258mkdv.pdfIn PDF document text
    • http://sq11mini.com/67215444319p8g1v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481985/normal_5fd157dd58456.pdfIn PDF document text
    • https://zirakamu.weebly.com/uploads/1/3/1/3/131398357/77f628df.pdfIn PDF document text
    • https://zofudugopevemob.weebly.com/uploads/1/3/1/6/131607066/1480616.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duginefasozuna.rf.gd/nufusawuvivewolif.pdfIn PDF document text
    • http://pumusejori.epizy.com/dietitian_pocket_guide_to_nutrition.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/how_to_exercise_with_bands_for_strength.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_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 5048 bytes
SHA-256: aeb711c685c52d4a45d5fdd6402fc7aa1c6a41211f1747ad48640f5e016ac830
font_01_sfnt_off00010df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF7 10736 bytes
SHA-256: e6778d65c54147845cebab1fe0452a05912fd922281467f651aed4f539cd39d3

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