Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1b88d0319c6bc9…

MALICIOUS

PDF

79.5 KB Created: 2021-02-24 23:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9319875a2e6889b541fb02b85d6b6b2d SHA-1: 268fccb2e009a1f7368013fd566d60ba9406aeed SHA-256: 7b1b88d0319c6bc9479b89c09bb1f3bd68ffefd99e9b895c1c58bfd0958b91b3
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a spearphishing attachment designed to lead victims to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=alpine+cda+105+auxiliary+input PDF link annotation
    • https://cdn.sqhk.co/japewaturu/Vihhgif/magnum_ice_cream_delivery_singapore.pdfIn PDF document text
    • https://cdn.sqhk.co/fepogosu/vmggjaY/die_together_plies.pdfIn PDF document text
    • https://cdn.sqhk.co/puzukebejas/jajhid8/guide_to_get_gems_diablo_3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448121/normal_5ffd3af65ecc0.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/cU0AZje/ratasezonisu.pdfIn PDF document text
    • https://cdn.sqhk.co/jumibizede/jbjfgdj/music_player_app_download_for_windows_8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443824/normal_60280ec1dbc14.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/94423946866.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/cuantos_cm_hay_en_un_metro_cubico.pdfIn PDF document text
    • https://cdn.sqhk.co/fakobijo/0L7Jhec/nuratolabir.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/hc5lnVg/34612707457.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/hMhihhq/faribexoxafopalowora.pdfIn PDF document text
    • https://cdn.sqhk.co/jepogedofuz/jibhbhh/19997602195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_6012a2a2d36fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452609/normal_5feb1e8a71eb7.pdfIn PDF document text
    • https://xigogedamexov.weebly.com/uploads/1/3/1/3/131384098/4303205.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/84878338953.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziwemasux.myartsonline.com/62282730782.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_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 5364 bytes
SHA-256: ead447bb8efff935d0681884d94b71bd8a1ac9911868a8ae6dc90a0b89a03271
font_01_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 12836 bytes
SHA-256: 361da4e4110cfa52d14d30652a2ef1f7989ee4d72fee36903e7ea0fcaef88364

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