Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba90e85883095a33…

MALICIOUS

PDF

75.3 KB Created: 2021-02-17 13:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 39b930babd7bad0e34d6af954f735178 SHA-1: 0af42aa2e849663c0dd9848172c8312c2f21de54 SHA-256: ba90e85883095a336f7011d302db865a2866cc81cc5a7417921d34637bdb8cfc
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically related to phishing and link farming. It contains a large number of external links, many pointing to disposable domains, suggesting an attempt to lure users to malicious sites. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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=screw+your+neighbor+card+game+with+quarters PDF link annotation
    • https://cdn.sqhk.co/fupokiwil/diiAjbk/vinolitogidejopelade.pdfIn PDF document text
    • https://cdn.sqhk.co/wojinagimepu/id8jjgc/blood_pressure_cuff_manual_professional.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/dwPvigJ/jomiluwevipo.pdfIn PDF document text
    • http://all-host.site/beginners_guide_to_constructing_thez0vmb.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/sonodutafubiguxibhr1cg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477164/normal_6009273895570.pdfIn PDF document text
    • http://onlineeshop24.xyz/sydney_opera_house_tours_ielts_reading_answers6bhhj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_600dcb95f08ae.pdfIn PDF document text
    • https://giwunoxesej.weebly.com/uploads/1/3/1/4/131408529/juxugamupix.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/vemefosufo-vudetag-dasijekufi.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/cHgcDwL/13117390278.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445337/normal_5ff4ec54a2b93.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/sivodajijinu-mixudeva-towazuzuze.pdfIn PDF document text
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/buwimukadabig.pdfIn PDF document text
    • https://gofetudorupu.weebly.com/uploads/1/3/1/4/131408581/9768767.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/satulibaren/lupirodebonuxijelefolid.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/fadanawubabubejejel.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_off0000e99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 5884 bytes
SHA-256: faa09f6e6a7a7d4cac358254797c61b0b6e0184d9a135d6c33a43e12c7d6d845
font_01_sfnt_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 10156 bytes
SHA-256: f9b7b736898631d0591945a159d27a643381085ed7cf9699c6801d133d344f08

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