Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff418b89587361d…

MALICIOUS

PDF

81.2 KB Created: 2021-05-07 01:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f75951e78c72e4f18cfbd1c34239d9da SHA-1: 1c0ab0d9edd05ad3514cd44d4450c05b77c188ee SHA-256: eff418b89587361d36a19affdf2b37facbea01d10e987020ee0a6715576af42d
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though truncated and obfuscated, appears to contain keywords related to product searches and document metadata, likely serving as a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://kuzutuzo.ru/strik?utm_term=craftsman+electric+trimmer+line+replacement
    • https://babibogek.weebly.com/uploads/1/3/1/3/131379554/3100499.pdf
    • https://tesafugefiwa.weebly.com/uploads/1/3/5/3/135318727/2161011.pdf
    • http://jesubenodewopob.22web.org/43841685933.pdf
    • https://cdn-cms.f-static.net/uploads/4409250/normal_600fa13f183e3.pdf
    • http://majedox.iblogger.org/mary_poppins_book_plot_summary.pdf
    • https://latoratepowubum.weebly.com/uploads/1/3/4/7/134713938/1663269.pdf
    • https://lanekugufer.weebly.com/uploads/1/3/5/3/135351315/runawumumujeb.pdf
    • https://static.s123-cdn-static.com/uploads/4495860/normal_5fcd9bb4e4b7e.pdf
    • https://sotogirepatobob.weebly.com/uploads/1/3/1/4/131453915/1628327.pdf
    • https://cdn-cms.f-static.net/uploads/4459165/normal_605382ec58d2d.pdf
    • https://wadoruzog.weebly.com/uploads/1/3/1/3/131379034/todixuwefo-jafuwanedoxeki-fixiva-tulodufez.pdf
    • http://rujawobezixevib.iblogger.org/72118320931.pdf
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/modukajimokewo-sugaji.pdf
    • https://static.s123-cdn-static.com/uploads/4487632/normal_6001907aed911.pdf
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/bemizerokulolusel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gasikogo.rf.gd/14924012450.pdf
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_9a5ffddc383343d2a8cc4342a5712b55.pdf?index=true
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_624820eade76418db94e6dd7d739a63a.pdf?index=true
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_c8cd730fea584104a4fa75ce7d73f9ac.pdf?index=true
    • http://selamamoli.epizy.com/wijujebofekalunovajamo.pdf
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_5e46eaeafffc4f978688498294b63bab.pdf?index=true
    • http://ralodanuf.rf.gd/fevawanawukusabutoda.pdf
    • https://4192d618-ecd7-4808-8485-efd4d6773ded.filesusr.com/ugd/17a5db_7ac7e298c62747389cd62533729cf0a6.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f278.bin
681a647920516159bc12c14c7c688f0ac0e8374fd6d1d3b028147a8508df13ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 4860 bytes
font_01_sfnt_off000102dd.bin
442cb37dfe42742891e05ca76bfa3feecbda6d0133e6d90fdbcc40d4082173f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 11128 bytes
font_02_sfnt_off000128d7.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x128D7 4324 bytes