Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38254ac9a5489ce…

MALICIOUS

PDF

76.0 KB Created: 2021-03-02 19:06:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 72d8fb397428d242bf276b99f716efdc SHA-1: a93a57a358eb2dea11416d0abc3f8de3c7b6a5c9 SHA-256: e38254ac9a5489ce205ee9e467373ceb5d250f14bf929325b69264ab71d761e7
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and URI patterns are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=how+many+calories+in+a+dunkin+donuts+cold+brew PDF link annotation
    • https://cdn.sqhk.co/runudori/hjZmiao/refuwunitaga.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/samsung_q7fn_65_specs.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/daiifCa/dog_balls_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/ifgjnOs/powariz.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/7wGyvwr/browser_bot_detection.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/C7hgZH8/coupons_for_walmart_grocery_pickup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bolirazebaf.myartsonline.com/fnaf_silver_eyes_espaol.pdfIn PDF document text
    • http://nopawalaxuwaw.onlinewebshop.net/64004798519.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/43082898334.pdfIn PDF document text
    • http://fawepajemug.rf.gd/bottesini_concerto_2_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/action_plan_format.pdfIn PDF document text
    • http://nerezusilanake.atwebpages.com/lenovo_g50-80_screen_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/dasikel.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/lebele.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F8 5444 bytes
SHA-256: 08a93711ae9cad4f200991cfe7ea34aba442da77055d5ec645219fd69969b7aa
font_01_sfnt_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0000fed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED3 10612 bytes
SHA-256: e0820062d0597ff8865c09f228e80bf75612c9ee614c2679d4365abe29afed3d

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