Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e78eaa78b80d02…

MALICIOUS

PDF

92.9 KB Created: 2021-04-30 14:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3f570df62a6237ccc4fb97a01775ea21 SHA-1: 1d6635bdc1f324b70bdb953bbfe2283ae1b71fd8 SHA-256: 37e78eaa78b80d02f1b13be111380a421594fd4a15c5238e0afa5928f92d9e7b
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 0.9994

Heuristics 6

  • 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.
  • 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/strik?utm_term=kitchenaid+stove+parts+manual PDF link annotation
    • https://cdn.sqhk.co/xonudutixova/aicWWjf/baxaguzad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451352/normal_606803439add1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403141/normal_601e88b65a665.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379487/normal_60063eceadf42.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/ajbZJIL/63984797603.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365657/normal_5ff1ec2ff09a8.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/fmhgdOh/larva_bricks_breakers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_6010dadb97872.pdfIn PDF document text
    • https://cdn.sqhk.co/gesafafo/hwPtqFl/ffxiv_crafting_leveling_guide_50-_60.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/iiia1Wo/traffic_racer_cockpit_3d_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407552/normal_60243a57364cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368493/normal_605fbdc7eb7d6.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/fe90d3ec82b0422.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470982/normal_60055b3398f78.pdfIn PDF document text
    • https://japugaze.weebly.com/uploads/1/3/5/2/135295186/783642.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374983/normal_5fe50030a503f.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/jjesgcP/t_i_game_milkchoco_hack.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://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_d44adcd3d06e4131b7d4a55cc32a0a9f.pdf?index=trueIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_cd0b9ad760bd4c078aab730ec4dec71f.pdf?index=trueIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_6e91805a7e4149f083fc9fe132c9d3b5.pdf?index=trueIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_3765ed16a68f4998b9ad369029af7a92.pdf?index=trueIn PDF document text
    • https://cf21b241-1edd-4e7a-8b85-4b7fa12bec5a.filesusr.com/ugd/835652_ec9e311d7a594fbdbfee7ba2a5d39659.pdf?index=trueIn 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_off0001187a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187A 5224 bytes
SHA-256: 8f174f417071cef3aa16c0b442e584a5f0f28e5930ad232fe7fc4dfd86d674b9
font_01_sfnt_off00012a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0A 14784 bytes
SHA-256: c6784646ca097ab8bfaed8adb954b17f57a8e13a6399419e9e40fae933088977
font_02_sfnt_off0001569d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1569D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3