Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fca3878967050f2…

MALICIOUS

PDF

65.6 KB Created: 2021-03-02 11:04:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 16eeb1821f02733356c9b995aed2a3ca SHA-1: d882de761b1da1ad00f77f8ffd327d8120239441 SHA-256: 9fca3878967050f2fd9bf4b5676a5bba42edd429d1f92ed5165576cd89da7f8a
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, many of which point to disposable domains and are used in a link farm configuration, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

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://zajinet.ru/strik?utm_term=bose+remote+control+instructions PDF link annotation
    • http://discovljzg.fun/graco_mysize_65_convertible_car_seat_expiration_datea81wg.pdfIn PDF document text
    • http://leadtop.co/autotune_untuk_adobe_audition_1._5f4qe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404293/normal_5fe8563528860.pdfIn PDF document text
    • http://alkim.xyz/rigurigefapapopdmfs1.pdfIn PDF document text
    • http://hydrofthol.space/live_streaming_news_cnnpp59k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407747/normal_600a8a45b542f.pdfIn PDF document text
    • http://braco.ru/lexuwunojutusik5rvps.pdfIn PDF document text
    • http://prazdnikprosto.ru/dezesanawigonetujuxifenikbv1c.pdfIn PDF document text
    • http://wirelessinfo.ru/faxijerulurufomulig0hod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461245/normal_5ff26129aecad.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/rutufokedizon/12v_2_amp_transformerless_power_supply.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/wivufumusonimatek.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/5655118267.pdfIn PDF document text
    • http://fukokikedusej.epizy.com/91399657012.pdfIn PDF document text
    • http://werewipabelud.rf.gd/1973_prowler_travel_trailer_owners_manual.pdfIn PDF document text
    • http://zitupelu.epizy.com/email_asking_for_information_about_a_course.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_off0000c733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC733 4784 bytes
SHA-256: 800d0c7cba8d9cc18a06c72e7979fcecf7b32bc4f2a223b739a7c30e2bda4dbd
font_01_sfnt_off0000d764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 10064 bytes
SHA-256: 2f31f035de7cdf55a0db79ca8e879fadd2fa8b67f1c11637f1b94ebe2847a49e

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