Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1ff605a7c97f0e…

MALICIOUS

PDF

80.7 KB Created: 2021-03-09 14:52:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7e0797b835b13ed19af3bc2720d606fa SHA-1: 670353bf5f0e30e643c5538e9c61c8e043aa859b SHA-256: dc1ff605a7c97f0e52367c06f174df99c6f32a34c15f7ee624e31da24b901269
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though truncated, suggests a lure related to educational materials, which is a common tactic for phishing or malware delivery. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=pedigree+practice+problems+worksheet+with+answers PDF link annotation
    • http://pokypka.xyz/4652713368948v2p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374360/normal_5feb714c39ded.pdfIn PDF document text
    • http://naturalgood.space/casio_edifice_solar_eqs-500db-1a1_manual45j26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486359/normal_60129cb67aaeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379606/normal_6017c69d6da7d.pdfIn PDF document text
    • http://a-trvl.ru/343374555005eh9g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5fec514fbd7c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411919/normal_5fdc0500f3f24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386073/normal_5fc5bc5446071.pdfIn PDF document text
    • http://medicinfo.online/vetizakuguvoleg0febj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485313/normal_5fce2eaaa402a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/99d1c115-0509-406c-8b0b-b1dbc2c0e797/zawunudodedola.pdfIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_6c100f1e76ae49d384add40f2dad418f.pdf?index=trueIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_6563ddf85d7e4ca2ab5d0d3f88633990.pdf?index=trueIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_efd2f41274df4dd48279bb78ec9b6214.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7965d24-14f9-4d4e-b1b8-6f0570ed4a67/resalemabef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28baf43c-abaa-48cd-ae98-86ca8c47d307/47048505028.pdfIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_33ee8e37e886439f8a96dc9e6d5d62ae.pdf?index=trueIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_43958533e4b24f42b578713ed68d03cf.pdf?index=trueIn PDF document text
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_99d700172a0744b3adc924ea1aa6f5cc.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_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 5572 bytes
SHA-256: d970a16fbd0bdfaeb5183222fa4c4465e38d793bf00366101e81602007a5799f
font_01_sfnt_off0001041f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 10228 bytes
SHA-256: 0231c55d2bf16d359878cab1dbdefc50df732827cc4adcd9c4eb4a56497fe689
font_02_sfnt_off00012716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12716 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f