Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c1fe7dad601f61…

MALICIOUS

PDF

78.3 KB Created: 2021-02-21 11:05:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3ef58317051372f21559848c99beac39 SHA-1: 5c434a6eb8a576761f44d515346fddc8de6f452a SHA-256: 95c1fe7dad601f61b639bc0d6cdaef6202b1f7ecb59d8e069ff170e35367eb90
214 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics as a malicious redirector and link farm, indicating an attempt to lure users to external malicious sites. The embedded URLs and the ClamAV detection strongly suggest a phishing or malware distribution campaign. 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://yafferge.ru/strik?utm_term=ensayo+de+comparaci%25C3%25B3n+y+contraste+temas In PDF document text
    • http://classkaod.ru/the_bowery_myrtle_beach_age_limitkotsk.pdfIn PDF document text
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/mivazokod-pegabi-rijafadazi-dusidibaramo.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/053b04ab38db3.pdfIn PDF document text
    • https://veworokog.weebly.com/uploads/1/3/1/6/131606039/bigexekidar_gavibezafomij_womuni_wekodegemifam.pdfIn PDF document text
    • https://dezazobe.weebly.com/uploads/1/3/4/7/134755526/a7bb4b3cee.pdfIn PDF document text
    • https://cdn.sqhk.co/poturofivat/djgijgd/choppa_right_beneath_me_playboi_carti_mp3.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/fed317d042.pdfIn PDF document text
    • https://milafesubori.weebly.com/uploads/1/3/4/7/134745217/barinolomup-koximosarut-megeda-jetoj.pdfIn PDF document text
    • http://getchambre.xyz/kadejenuwavejoputasjzgsy.pdfIn PDF document text
    • https://cdn.sqhk.co/gavoduse/ifbODgg/vazobepamalopatodim.pdfIn PDF document text
    • https://nenilinuda.weebly.com/uploads/1/3/1/3/131383514/sefowiri-zijil-namet-rurazejafu.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/bajuse/decompensated_congestive_cardiac_failure_guideline.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/auto_file_in_php.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/amazon_prime_video_on_ps4.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/johannes_brahms_lullaby_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/29318525911.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/love_dare_challenge_day_17.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/16701096861.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_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 5380 bytes
SHA-256: db164cc3186cfb3fa9d9fae75e035fa3453ce4030284b2b8803b73469e8e8198
font_01_sfnt_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 11412 bytes
SHA-256: 1756fafb79c34dc6be43379ed2cc4aaa674a857fe5ff9ef14484fed04f8ed6b6

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