Malicious PDF — malware analysis report

Static analysis result for SHA-256 99da670909bf1cc8…

MALICIOUS

PDF

85.2 KB Created: 2021-03-01 02:23:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e263a6259d6a35f261e2cdd2819e0d90 SHA-1: 2d86191834c24cb31ccea6e96cf05be628ecb34a SHA-256: 99da670909bf1cc834edc96fa7ebc20bbad7e4f874ec39a9cc428e143cfad399
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a malicious URL. The ML classifier and ClamAV detection strongly support this assessment. The embedded URL leads to a phishing site disguised as a free download, likely to steal credentials or deliver further malware.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=student+exploration+electron+configuration+worksheet+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468551/normal_601f06c559270.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366367/normal_5fe0358a9509c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483604/normal_603775acda63b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_5fd2ef2f1aeaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461205/normal_5fea393529631.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/lemerisinivum/purpose_driven_life_day_4.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/54479244355.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/xisoxugowebur.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/contemplate_deutsche_bersetzung.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/46727964819.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/staar_essay_planning_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/debajisuvapowokosoxexeme.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/gramtica_ingls_bsico.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/zefipenodilezejugidalo.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/charminar_kannada_movie_radha_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/allure_test_report_c.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/predictive_analytics_reporting_tools.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/nutrition_facts_for_starbucks_almondmilk_honey_flat_white.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_off00010da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 5848 bytes
SHA-256: bc45e41e6bd7a29c818321862bddf29e457cbf08599ba032728682f2d6b247ac
font_01_sfnt_off000121a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A4 10988 bytes
SHA-256: 938c74b8bdb49d9fe24956a5f1700da72bfbc9dd6bc59e638993f12929946105