Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92f48ce13cfc3a1…

MALICIOUS

PDF

100.8 KB Created: 2021-03-26 12:38:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a21f24ea36d4e8f897597f019336dca5 SHA-1: ba9c370289ccd808461ecbecdc0e8f3f0addf608 SHA-256: e92f48ce13cfc3a1b253bc6d71e441dc9be0369bd333e4bd308ad6ce590e8738
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are used to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=pose+method+of+running+by+nicholas+romanov+pdf PDF link annotation
    • https://cdn.sqhk.co/bulunazi/idhahj6/64022914978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_602bafdc6845d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505839/normal_60012624a1748.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/wjf09r3/39028336398.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/56559738742.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/ggjihaC/55184148318.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412999/normal_5fefdf9063110.pdfIn PDF document text
    • http://gomesuzos.mypressonline.com/9928126137.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/fgiEkgc/word_crush_hidden_themes_appearance_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/X8VZicM/68763635452.pdfIn PDF document text
    • https://cdn.sqhk.co/pidagasew/hagjqgf/freelance_graphic_design_jobs_denver.pdfIn PDF document text
    • https://cdn.sqhk.co/rokajoten/Bihjcjg/41342130341.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/03db1cac-ca9c-4954-99d3-21ddba45f97b/diff_between_promissory_note_and_bill_of_exchange.pdfIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_09a6547a0d0f45a0b52098a35c559ef2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d5a6dd2-8e84-4118-b77c-cea867dcfcbf/vetow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a8af36f-a500-40a4-b533-11baf6016d57/zomivilawaragarub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d9ca9b-e98d-417a-bf14-1dce3929962e/51604880795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23e6ccc1-171a-42f9-94bd-d5880fdf1d2e/57015847197.pdfIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_ccff4301c19e4382bc6a286a3f539abe.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_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 28332 bytes
SHA-256: 0d0567d557ce9baa95ba38fcbb5265d9cf2a3e6684304d1b63d41683ebf998e1
font_01_sfnt_off0001495c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1495C 5872 bytes
SHA-256: 6c11a141810d487a17fda7c1d9f52833c30170f7cd6098262c0ca611304bb3f5
font_02_sfnt_off00015d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D41 11488 bytes
SHA-256: 44ed258d0035977e537ef4cb2c13e93ab04b6ca841f4eca04d5680323a6b16dd