Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f183fa5d31d0fa5…

MALICIOUS

PDF

86.8 KB Created: 2021-05-20 18:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0e95d686269dd039d03c07dc0015c927 SHA-1: eea3fe183cc80a4b0a1a09da36d32c38cfcdb055 SHA-256: 1f183fa5d31d0fa575ec542092afc6bd35ce4768325bf7d34fc09e93d69bad54
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9989

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://dafemum.ru/strik?utm_term=bubble+shooter+game+free+download+for+pc+windows+7+32+bit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479460/normal_5fee3c2a4c285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455886/normal_606dfe87a36f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446401/normal_60462d9d7929b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368747/normal_5fd7b523d4150.pdfIn PDF document text
    • https://gadipofonikiw.weebly.com/uploads/1/3/4/3/134390141/tukuzuzunon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482216/normal_60125f8e7c3c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426416/normal_5ff5105e0dc53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476302/normal_5fd88a5168f3a.pdfIn PDF document text
    • https://livabobuladezer.weebly.com/uploads/1/3/0/8/130874084/3d603.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/kedenepudikep_mudiwedo_muzodaxefuvaru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379856/normal_5fced2755f047.pdfIn PDF document text
    • https://ziwegakesamud.weebly.com/uploads/1/3/4/4/134468237/2590534.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409826/normal_6014aab7b5a58.pdfIn PDF document text
    • https://nozojotama.weebly.com/uploads/1/3/4/5/134585139/nukuxarakalisofobam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447096/normal_5fc8eab7badc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418197/normal_6055b02a6e095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_606b7c97966d9.pdfIn PDF document text
    • https://jomagikovire.weebly.com/uploads/1/3/1/4/131408086/dijitukulopofoputop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465907/normal_606b4603e24ca.pdfIn PDF document text
    • https://niwurakoj.weebly.com/uploads/1/3/4/5/134588258/3c3f4a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484835/normal_5fee33fc1bb56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387919/normal_5ff282bbcc808.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://uploads.strikinglycdn.com/files/36c40dd8-0f0a-4fab-b002-918220f5a7b0/home_maintenance_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9262f536-0229-4a7f-a7cf-910447fc0a9f/grendel_john_gardner.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10445 6108 bytes
SHA-256: dfaeb9e1d1e4edcee1172f14fafebca186d9fadf1054b7419b6a4613d564875a
font_01_sfnt_off00011900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11900 11072 bytes
SHA-256: c2325dbf0f948090cb3fa2ca243f6468846dc9975654a136cad8faf7315b9eb6
font_02_sfnt_off00013eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c