Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a83d5b37fd34fb…

MALICIOUS

PDF

65.7 KB Created: 2020-12-11 13:11:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 384a125caa66d5e9d8ff8c3688ba40ee SHA-1: 176a30d32a8e9edf54800beabd231bb2c2ca35e9 SHA-256: a4a83d5b37fd34fbbdb18aed5e9b3f754cded22a11d0136b18c1f7135c28b203
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of embedded external links, characteristic of a link farm or phishing campaign. The primary URL identified is https://trafffe.ru/strik?utm_term=categorical+numerical+discrete+continuous, which likely serves as a landing page for malicious activity. No scripts were extracted, but the extensive link embedding suggests a phishing or SEO spam attack pattern.

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
  • 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.
  • 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://trafffe.ru/strik?utm_term=categorical+numerical+discrete+continuous PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371248/normal_5f911dad56c9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451750/normal_5fb546e94e2b8.pdfIn PDF document text
    • https://xumolatakikekum.weebly.com/uploads/1/3/4/3/134335049/kofojajurumar_wokepikumevob_pupakixogis.pdfIn PDF document text
    • https://rofipufexorijol.weebly.com/uploads/1/3/4/6/134656377/xadamevaluvenelexuzo.pdfIn PDF document text
    • https://gusobenatidisa.weebly.com/uploads/1/3/4/4/134475091/80d319e41f.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/zazelujeju/10568733550.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ea21c30a162e0c52977d/t/5fc15563173fb5383bd42f5c/1606505828351/37386834218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9a11d3e-e1f0-40eb-87b5-05b84b0994b5/jirekasadobemopure.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/soulseek_like_android.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc290a36609fd0ee79c0a56/t/5fcaf75b1df7590d80d6ffd4/1607137122322/minetest_game_mods_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/247135d1-3f9b-415e-9a56-963061a28507/xagetodoxubit.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/sale_agreement_form.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/i_like_to_play_basketball_essay.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_off0000c473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC473 5164 bytes
SHA-256: 721e3ba204c539b43ad88333dd73744c360dbc83d283f3f82329d788141e4afe
font_01_sfnt_off0000d5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E4 10616 bytes
SHA-256: 0583ada40fd26352994246205e4b62f401e55e3ce50727845841e557089365ca

Open this report in the interactive analyzer, or submit your own file for analysis.