Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ea2d38a4563259…

MALICIOUS

PDF

77.6 KB Created: 2021-04-25 09:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 035067b3a11e3189b9465eaf3d4c355c SHA-1: be54bf566c3a65fa52174a4489d4ebc4181fd146 SHA-256: 58ea2d38a4563259f50b4b068a749ca13a9db2c21e040508a5f6d5b4de77c089
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://gimoguvi.ru/strik?utm_term=python+dictionary+update+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488332/normal_5fd04f9468c49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465018/normal_5fd627da42e70.pdfIn PDF document text
    • http://elerctum.org/70964603849t87aa.pdfIn PDF document text
    • https://cdn.sqhk.co/sokulutesi/95U4ngi/sadosefidosatefu.pdfIn PDF document text
    • http://herss.space/mowojawixavajurazagaphnu9i.pdfIn PDF document text
    • https://cdn.sqhk.co/jenojigise/hEgjmDB/warhammer_quest_ios_characters.pdfIn PDF document text
    • http://reduslim-europa.site/633800223883rc0w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413701/normal_5fea42afa70f5.pdfIn PDF document text
    • http://usacreditcheck.info/rumi_books_hindijzjhy.pdfIn PDF document text
    • https://tuwebiparixe.weebly.com/uploads/1/3/4/6/134674666/b175860cdc61e6d.pdfIn PDF document text
    • https://cdn.sqhk.co/xesoralo/79hxChf/streamline_english_2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450430/normal_5fcaabec63d44.pdfIn PDF document text
    • https://lipuxavevafip.weebly.com/uploads/1/3/1/3/131398459/vagumemit.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/Khhhaib/xotexibanejosan.pdfIn PDF document text
    • http://help-violation.com/battery_tender_jr_walmartbxzft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495387/normal_6016413c9ae94.pdfIn PDF document text
    • http://sberbank.link/cuori_heater_partsyapn9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tisigivikevutik.rf.gd/restrictive_and_nonrestrictive_clauses_worksheet.pdfIn PDF document text
    • http://bumerezuwo.epizy.com/dotimososa.pdfIn PDF document text
    • http://gevotuwelu.rf.gd/42_murray_riding_mower_belt_diagram.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_off0000ee4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 5120 bytes
SHA-256: 46cc8fb7eb10c61590b3e5c254996907a2350eb6d7909303d15039bd6599c36b
font_01_sfnt_off0000ffbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 11656 bytes
SHA-256: cae7c50184425a4356dc28ee75381480115f0ccdba5b2fea0f9c23b1bcbd5032

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