Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23d90875bbefc7d…

MALICIOUS

PDF

68.4 KB Created: 2021-02-13 20:05:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d2dd31e14241364a810c55ce4fd98c34 SHA-1: b1aed9d58a0db3dcbc0ee5590fab69aebf290484 SHA-256: c23d90875bbefc7dcfec9161cadf9bf1619202caa0d89da850f3e3330f43f8b4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, with at least one pointing to a link farm hosted on disposable infrastructure, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true malicious destination.

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://seumenha.ru/wix?keyword=lons+family+haircuts PDF link annotation
    • http://trackengine.host/certified_analytics_professional_study_guide6j83d.pdfIn PDF document text
    • https://rinavupitaf.weebly.com/uploads/1/3/1/1/131164375/9394746.pdfIn PDF document text
    • http://demijuv.iblogger.org/aurora_borealis_information_english.pdfIn PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/kikawibafefu.pdfIn PDF document text
    • https://pixerogamaba.weebly.com/uploads/1/3/1/8/131871590/vurifakepovoja.pdfIn PDF document text
    • http://telemprom.xyz/42041207532qbl26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413363/normal_600615fa2b708.pdfIn PDF document text
    • https://visoxifa.weebly.com/uploads/1/3/2/7/132740860/kigegak-rakubesowo-jitebojana-vanuwame.pdfIn PDF document text
    • http://ipatovaalena.ru/53846047963lbvc5.pdfIn PDF document text
    • http://mozujana.22web.org/all_in_one_messenger_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rezopaduj.epizy.com/difference_between_budgeting_and_forecasting.pdfIn PDF document text
    • http://barukes.epizy.com/63108020885.pdfIn PDF document text
    • http://sakikuzugodo.rf.gd/kesorewokopapifa.pdfIn PDF document text
    • http://nototen.epizy.com/avenue_supermarts_ipo_performance.pdfIn PDF document text
    • http://ziresam.rf.gd/85122203623.pdfIn PDF document text
    • http://nikuzemadol.rf.gd/guzikop.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_off0000cfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE9 5164 bytes
SHA-256: a12f36ca586f24ff0a02ef85be331cd5dae32b9d53adf29548a03560ef47c7a0
font_01_sfnt_off0000e15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15A 10460 bytes
SHA-256: 881043b06bb42cd5164c2f89a9e05ba8f01b9143f0dbf1ee56961174e3fce458

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