Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f85d2d41b6ac15c…

MALICIOUS

PDF

76.1 KB Created: 2021-02-28 07:53:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bfbf3c60b65d53c69644b6371039038d SHA-1: 8742ba4013d6ae93720afd5ec3edcf50eb8b3330 SHA-256: 7f85d2d41b6ac15c05c52267f00f9d78364f09a03c4773c6c62da9606550d9d4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links pointing to domains that appear to be disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or other malicious content. The document body text is heavily obfuscated and appears to be junk data, further supporting the malicious nature of the PDF.

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://midufefew.ru/strik?utm_term=electrical+engineering+technician+schools+near+me PDF link annotation
    • http://rafupofamurawaf.mygamesonline.org/jotigunorufesesinulegiliw.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/que_significa_cuando_sueas_que_tu_pareja_te_es_infiel.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/0hg1gem/10043997916.pdfIn PDF document text
    • https://sugibovipebu.weebly.com/uploads/1/3/4/7/134705953/8935808.pdfIn PDF document text
    • http://detonic-shop.website/13350239739nqklt.pdfIn PDF document text
    • https://jasazifo.weebly.com/uploads/1/3/1/4/131437377/fibom-konapadabuzu-pudowilatisa.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/g3agimx/wojoluxiwegivewexurave.pdfIn PDF document text
    • https://cdn.sqhk.co/bemovunilupo/gRBTibV/sudogotojipujowizunex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403685/normal_5feef0058f1ea.pdfIn PDF document text
    • https://cdn.sqhk.co/fakosopalo/dWigVsW/2_players_car_games_free.pdfIn PDF document text
    • https://tipiwaterexiw.weebly.com/uploads/1/3/3/9/133997214/1758259.pdfIn PDF document text
    • http://instas.site/stocks_investing_for_dummies1mbir.pdfIn PDF document text
    • https://zitozujenuzudip.weebly.com/uploads/1/3/4/0/134042901/zexipekuguta_lijowopedemotaf_gosimajepafuj.pdfIn PDF document text
    • http://retys.space/crossroads_mall_st_cloud_lockdown5e6p8.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/amghpMr/dune_battle_for_arrakis_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zegokufa.epizy.com/r15_v3_launch_date.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/project_management_tools_and_techniques_list.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_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 5172 bytes
SHA-256: 1873b132eaa6054f98987d3cad9ac885dc971390f2b4347fe3a97907792be25a
font_01_sfnt_off0000fe3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3E 10924 bytes
SHA-256: 69eccb2bef2376d63ee299c0ee5b655daf4a2180c93bd46bdfaa34523fe20805

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