Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ec7a0ad25603a6…

MALICIOUS

PDF

72.9 KB Created: 2021-03-06 04:37:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: edfdce604e7c72976880f5d3a0ae77e3 SHA-1: 7197558961bea5833835abd93dbe9fdcbef68471 SHA-256: 97ec7a0ad25603a649bae7b44aefa10f8f960c50f9fd2c45cb9f9c2b67a72c11
126 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as https://golowaki.ru/strik?utm_term=hl-l2360d+reset+drum, likely lead to phishing or malware download sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://golowaki.ru/strik?utm_term=hl-l2360d+reset+drum PDF link annotation
    • http://zubiki.top/8671347742753fnl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407087/normal_6017345ecaefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384144/normal_5fda4b0aa9cf1.pdfIn PDF document text
    • http://fsbsiod.com/stryker_ambulance_stretcher_pricet2srg.pdfIn PDF document text
    • http://doworevo.22web.org/asa_fastpitch_softball_rules_bats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_6042d340e0ae2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420776/normal_60006c01bf0df.pdfIn PDF document text
    • http://dreabling.online/73852065535vqmlv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489404/normal_603168b7849bd.pdfIn PDF document text
    • http://organic-ita.space/apps_whatsapp_2018d2kfo.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/frigidaire_refrigerator_door_bin_shelf_part.pdfIn PDF document text
    • http://ontrade.top/the_trial_kafkam1f91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_6014e6db5b7d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451217/normal_5fdc85a981a20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463559/normal_60214dba288ad.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/52977661851.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486053/normal_601b61d38440d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lomuripejo.epizy.com/dolulurimoxavixalu.pdfIn PDF document text
    • http://jurobedakos.epizy.com/sonetofuwalabepepimunego.pdfIn PDF document text
    • http://donolipapaxe.rf.gd/15576136422.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_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 5348 bytes
SHA-256: 3a2d70066c1c14e0b70bd4f237c3bd41a5750a58ace738843bebfa7a674fd619
font_01_sfnt_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 10616 bytes
SHA-256: 394cbb550c2f8663c83b116b90d41e3f4bf384e7225d612a5917ece857bfb303

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