Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71148fe18dcf44c…

MALICIOUS

PDF

81.5 KB Created: 2021-04-05 03:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fb5cbb17cdd789c2ecf3dcfb4a652b9f SHA-1: d77388066886533725c4445eb3b9852064a476c4 SHA-256: f71148fe18dcf44c759d60a7937a3acb627c433208b0e2cbbb34a3053141dcaa
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable or used for link farming. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the PDF structure suggest an attempt to lure users to external sites, potentially for credential harvesting or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://lozipotod.ru/strik?utm_term=where+is+the+best+place+to+donate+furniture PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493876/normal_60394790a297e.pdfIn PDF document text
    • http://helpverifybadges.com/oxford_discover_5_worksheetsmyq14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393364/normal_5ff11e5f61a4c.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/Mihgdhb/lilufaduganikizaterogigu.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/dcge9hj/70940230445.pdfIn PDF document text
    • http://krokoboko6.xyz/luguxomajol7cw.pdfIn PDF document text
    • https://kobuxomibusopi.weebly.com/uploads/1/3/4/6/134609859/8117490.pdfIn PDF document text
    • https://sasopezanureje.weebly.com/uploads/1/3/4/6/134691995/gupizafurot.pdfIn PDF document text
    • https://vixagudidiw.weebly.com/uploads/1/3/0/7/130775505/9069782.pdfIn PDF document text
    • http://xviiivbgz.com/vevalu1h1v7.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/zzdicgM/mysterious_maze_osrs.pdfIn PDF document text
    • http://matcobzor.ru/regulamento_do_imposto_de_renda_rir_2020_23o_ediolzudv.pdfIn PDF document text
    • https://menudobuwowewil.weebly.com/uploads/1/3/4/7/134765252/tekogupolelasumejebo.pdfIn PDF document text
    • http://helpforteam.com/dd_monster_maker_downloadz47bv.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/tjjhbWn/street_fighter_5_rage_quit.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/iTqfqie/31920683258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370529/normal_6051ff729d221.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_6068ef0faa8c7.pdfIn PDF document text
    • https://gubijebe.weebly.com/uploads/1/3/1/4/131483267/kenuvofor.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/yziikgg/lutejufe.pdfIn PDF document text
    • https://pozivikebesar.weebly.com/uploads/1/3/4/7/134759309/4908663.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/MhgGsll/26577090480.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_off00010114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 5396 bytes
SHA-256: aad7699dbc75c9d2ec9f71e8381acfc0bd4f8b72fb79e6278a283347c13ea11a
font_01_sfnt_off00011371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11371 11076 bytes
SHA-256: 3590016cb8b33bd3350ac21aece735a36878a5535df3ceba3a2614ac30a498ce