Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b31878cfed01c74…

MALICIOUS

PDF

82.8 KB Created: 2021-02-16 00:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bb55f8e5aac5db2d5f76e12f766dbfbb SHA-1: fa4dca315c90d5337e434d6434df5ecd8fa47e69 SHA-256: 8b31878cfed01c743c642a77c7186631bf19977796cacfe84cb6d6705b064215
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm. Several heuristics indicate this is a malicious SEO tactic, and ClamAV detection confirms it as a phishing trojan. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wix?keyword=lc+bird+high+school PDF link annotation
    • https://rokotejipap.weebly.com/uploads/1/3/0/8/130814190/riladu.pdfIn PDF document text
    • http://rejobumutoge.22web.org/shell_company_list.pdfIn PDF document text
    • http://klossheff.xyz/langrisser_hero_guidesjp16.pdfIn PDF document text
    • https://demaxezobenila.weebly.com/uploads/1/3/1/8/131856353/wilaxuzunexutap-mivawutus-sutakosazosip.pdfIn PDF document text
    • http://raxijinerig.iblogger.org/accra_technical_university_courses.pdfIn PDF document text
    • https://vimudizod.weebly.com/uploads/1/3/4/6/134632239/1902565.pdfIn PDF document text
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/568dfa.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/hhhcBif/ifttt_discord_twitch.pdfIn PDF document text
    • https://mugijimefulex.weebly.com/uploads/1/3/1/6/131606494/7a708a4bcbba5.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/hgjd0FK/73708412378.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/LidgjeK/ludidavijuz.pdfIn PDF document text
    • https://cdn.sqhk.co/ditamozulipo/jekghjj/72269326618.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fagufobukabovu.epizy.com/6215860914.pdfIn PDF document text
    • http://juwemijawikipo.epizy.com/visiting_card_ppt_template.pdfIn PDF document text
    • http://fakomufe.epizy.com/manuscript_template_elsevier.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_off0001061a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061A 5072 bytes
SHA-256: a602a58c1b85e2def3dbf9331db1d7ad773121bb9064df8106044be4311bf2b3
font_01_sfnt_off00011754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 12052 bytes
SHA-256: 1506ab230c084b405e08dd9a2e6eccae61aa16202883a862f0c4a8b17f8a51b7

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