Malicious PDF — malware analysis report

Static analysis result for SHA-256 7656ccc140b31c32…

MALICIOUS

PDF

117.0 KB Created: 2021-03-30 18:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e1d66bfb7f01aa65d482b8ac70beb93f SHA-1: c0d00e9f51a3fdb261a852469a376ef493a6390f SHA-256: 7656ccc140b31c3276c965b492dd9cc37ebf796137294d0a16d3356b6586ed15
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://resalured.ru/award?keyword=technology+readiness+level+pdf PDF link annotation
    • http://shopeuro.pro/vobezebataditebetadap8t64l.pdfIn PDF document text
    • https://zukudanasoxe.weebly.com/uploads/1/3/2/8/132815154/fabdc.pdfIn PDF document text
    • http://xtrading.buzz/kupesizimodaled1wim.pdfIn PDF document text
    • http://scm03.ru/84836629341yotts.pdfIn PDF document text
    • https://kevavabine.weebly.com/uploads/1/3/1/4/131406582/tuxeganike.pdfIn PDF document text
    • https://tovimovu.weebly.com/uploads/1/3/0/9/130969206/sutuletat_xofelajoxupume_gaxoworena_jaselixudapata.pdfIn PDF document text
    • https://pazomanu.weebly.com/uploads/1/3/1/0/131069777/fokidunifura.pdfIn PDF document text
    • https://kofivenemiwelew.weebly.com/uploads/1/3/1/3/131380814/kobulufa-koviv-sufubawit-kasawafoj.pdfIn PDF document text
    • http://golosa-spasibo.ru/thendral_vanthu_theendum_pothu_mp3_free_downloadjv95y.pdfIn PDF document text
    • https://sinujezujano.weebly.com/uploads/1/3/1/6/131606051/xikojugavusukawujabu.pdfIn PDF document text
    • https://rusolozotiwar.weebly.com/uploads/1/3/5/9/135992237/gopuladafamil-xusen.pdfIn PDF document text
    • http://jadebey-x.com/bedugunufp4ss.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/famevodalijataxuwut.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/learn_english_online_for_spanish_speakers.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/2nd_class_maths_textbook_telangana.pdfIn PDF document text
    • http://vurosija.epizy.com/absorption_coefficient_of_materials.pdfIn PDF document text
    • http://varitumowu.rf.gd/64312345791.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F5B 5236 bytes
SHA-256: d43345a65f74c77d7bbeb84bed0e8066c5a7027384a2f2bc98b6a973884ad6c3
font_01_sfnt_off00019120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19120 11688 bytes
SHA-256: 21c2ba618ee50e84b73c10ee925aea07080c3e8965cac98655b31e0c1e3fec91
font_02_sfnt_off0001b8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8E9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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