Malicious PDF — malware analysis report

Static analysis result for SHA-256 11020d10a9983566…

MALICIOUS

PDF

75.8 KB Created: 2021-02-26 19:59:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0aca02272a80f44424290e357274f2bc SHA-1: 438494817b2c5e34b904f1fd1ab4fdc33bdbbb97 SHA-256: 11020d10a998356607d87cf33b81f1ffc92db45d8c864e34fa3709db07b953bd
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a lure related to book quotes, which is a common tactic for disguising malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://vilenefex.ru/123?utm_term=pride+and+prejudice+book+quotes+with+page+numbers PDF link annotation
    • https://banukusisazej.weebly.com/uploads/1/3/4/8/134893357/dofoxesesilegug-gegilozipoweguj-duliwitevarezel.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/lhiPZhg/94070339097.pdfIn PDF document text
    • https://cdn.sqhk.co/ramejolir/geiagcf/the_sandbox_craft_play_share_uptodown.pdfIn PDF document text
    • https://pabekebu.weebly.com/uploads/1/3/5/9/135990513/7ff891fc173d.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/6500212.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuronufepu/A9hiqgi/silvercloud_gps_not_working.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/1001055.pdfIn PDF document text
    • https://buwipifigidorip.weebly.com/uploads/1/3/0/8/130813409/c0785fc57f.pdfIn PDF document text
    • http://monongzhlh.space/school_management_system_php_project_githubgxt5y.pdfIn PDF document text
    • http://italywom.space/375120259469iqmg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453333/normal_5fcd9e07487f7.pdfIn PDF document text
    • https://ludolukek.weebly.com/uploads/1/3/4/6/134699908/5832734.pdfIn PDF document text
    • http://centerverifybadge.com/charles_bukowski_poems_bookagnmg.pdfIn PDF document text
    • http://iranianvc.com/cbt_for_dummies_reviewkt5gi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419857/normal_6031676b84716.pdfIn PDF document text
    • https://putonikasobex.weebly.com/uploads/1/3/1/0/131070178/13b16e7426e4.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/xenavuxa/daruf.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/91236001902.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/22392522967.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_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 5956 bytes
SHA-256: cea5fe264b67e2302b25f5132ac31159bf9b9fc6a482839322406cf4ba3d5744
font_01_sfnt_off0000fcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 10976 bytes
SHA-256: 15a9f05ac6c8070e2190d9cf1facbf0c9fb4d68c8f33a069be03583a863a5178

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