Malicious PDF — malware analysis report

Static analysis result for SHA-256 7907eebc9a85ed83…

MALICIOUS

PDF

87.0 KB Created: 2021-02-26 11:15:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 794b0b969374ef876baab8f1e686ff41 SHA-1: b83151be25457233d28178fff84382e5b358eb20 SHA-256: 7907eebc9a85ed832439fde8fef98063c12affa164538cf54f33ee399fbdad79
214 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a search result for technical documentation. This suggests a phishing or scam attempt to redirect the user to a malicious site. The presence of numerous other PDF links, many pointing to S3 buckets, indicates a potential link farm or SEO manipulation tactic to obscure the malicious destination. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/wb?keyword=python%203%20write%20dictionary%20to%20text%20file In PDF document text
    • https://janafapaxe.weebly.com/uploads/1/3/1/6/131606835/fotipiw.pdfIn PDF document text
    • http://coolstudent.space/zizuvitoxig4ah2r.pdfIn PDF document text
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/8506252.pdfIn PDF document text
    • https://genunilime.weebly.com/uploads/1/3/4/3/134344847/kazevemigo.pdfIn PDF document text
    • http://podipotekoi.ru/39111407338ztbet.pdfIn PDF document text
    • https://vidisuxusa.weebly.com/uploads/1/3/1/6/131606291/eaa22d628beb.pdfIn PDF document text
    • https://wumigativagulam.weebly.com/uploads/1/3/1/6/131637174/de03d793308a.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/juvetaso/how_to_check_aging_report_in_tally.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/company_profile_mockup_psd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/62079332202.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/the_bulletproof_diet_book.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/aparichit_full_movies_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/centralized_ac_system.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/1665720761.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_off0001147b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 5356 bytes
SHA-256: 49b2a1eab72d390239227cc7183bb843c768f0a1c2d30e7064a7726bf3d154fd
font_01_sfnt_off000126d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D1 11736 bytes
SHA-256: 318783231140aa26c9c6dfa062eedc5284fb22100f1854c481d948dd1c30d63c

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