Malicious PDF — malware analysis report

Static analysis result for SHA-256 f487e08d62da4c88…

MALICIOUS

PDF

70.0 KB Created: 2021-03-03 22:37:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 251b19ab6a1a9a0a3e75001ea5dab559 SHA-1: f6804060b25eecbd786ce2d0a8183792ea985ee4 SHA-256: f487e08d62da4c88d431703ca90e25c8eca1a1504b35d20f61b5b3bd7881326b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm or phishing campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_URI heuristics indicates an attempt to direct users to external, potentially malicious, websites. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/wix?keyword=the+holy+piby+pdf PDF link annotation
    • https://cdn.sqhk.co/wepurodapike/5ja7iim/cowboy_single_game_tickets.pdfIn PDF document text
    • http://bevasesebesed.iblogger.org/cgp_ks3_maths_answers_online.pdfIn PDF document text
    • http://ryduslim.website/58654565163whgxb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455183/normal_5fdec8eae4d19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5ff0d9dd4ce69.pdfIn PDF document text
    • https://cdn.sqhk.co/solalokazili/woThhta/nostalgia_electrics_kegerator_not_cold_enough.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502698/normal_6023cfd035334.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/6SatdT2/gipusuv.pdfIn PDF document text
    • http://opt05.ru/whirlpool_wtw5000dw1_manual2kf49.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/hhi4uji/smartmusic_login_code.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_5fdbd91c2c1fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuvidatar.rf.gd/do_wendys_nuggets_contain_egg.pdfIn PDF document text
    • http://laraderedo.epizy.com/pepekokuxevimujafex.pdfIn PDF document text
    • http://wijogural.epizy.com/sisejilaxiweporotakasora.pdfIn PDF document text
    • http://posijibanif.epizy.com/81241109010.pdfIn PDF document text
    • http://mafonoxerinomif.epizy.com/synthetic_communications_template.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_off0000d89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89A 4836 bytes
SHA-256: c3e1a872a83f825c3624ab06c1a4155c78aae284dc3b5d978b697e76ace864b1
font_01_sfnt_off0000e90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90F 9912 bytes
SHA-256: 4e2e37d602da40f42177ed24d25689cc893a6fc03f9836d14e6c8e0e9dd80340

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