Malicious PDF — malware analysis report

Static analysis result for SHA-256 30d55382cfd2bbbc…

MALICIOUS

PDF

71.9 KB Created: 2021-02-02 12:24:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d4486cc7fdee17c5ba10b13f59ad612e SHA-1: d3bcc77efd729202c82ed6b6918ddf2a1cecc2a5 SHA-256: 30d55382cfd2bbbcd0a088e2375d766d6617a4d21e3d4db6f7f2385a208668c1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. This suggests a tactic to manipulate search engine results or to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://jottigo.ru/123?utm_term=rb+paramagnetic+or+diamagnetic PDF link annotation
    • http://rezonansmusic.com/stockyards_hotel_celebrity_suite6okxo.pdfIn PDF document text
    • https://widonudafedezu.weebly.com/uploads/1/3/0/7/130776490/kipilegoreru.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/gigj2X6/29531102988.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/cH9jbds/42101171168.pdfIn PDF document text
    • https://renepavavoz.weebly.com/uploads/1/3/4/0/134012855/dirazogumoku-noxij-bujibofe-rafovavexutosof.pdfIn PDF document text
    • https://ronifevux.weebly.com/uploads/1/3/4/7/134737402/potinojikux-nixopexalopu-pemafofavu.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/ggPxDgd/49164711659.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/N4QihOa/lijexarovipo.pdfIn PDF document text
    • http://trokot-shtorki.online/xefunabujiwakoqyqk6.pdfIn PDF document text
    • http://ing-cliente.com/calmradio_com_relaxing_musicfaeh6.pdfIn PDF document text
    • https://nunavataregexo.weebly.com/uploads/1/3/0/7/130775742/fiwatazuvevexi.pdfIn PDF document text
    • https://cdn.sqhk.co/fopalixogul/Fhaahgm/alien_zombie_shooter_2_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7B 5332 bytes
SHA-256: 2b8694d7173cf7d0d1b36f4643c7af534b4c8c0599147f7b6dc2c7b3cfb553de
font_01_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 10652 bytes
SHA-256: 5fb45a8f6a88e0544152e6a54b284b981f9e37a9ba25ff125988a71dcbb66fc3

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