Malicious PDF — malware analysis report

Static analysis result for SHA-256 460fb6f9627272ff…

MALICIOUS

PDF

75.2 KB Created: 2021-03-24 15:16:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 49cdbcfde217e1823f42f83965c315ab SHA-1: ea4b8d996e8900afe64720991c48abfe5ead07c6 SHA-256: 460fb6f9627272ff0708593ff2e98a3783476a1c75c0ebeec66ffae3fa16ec11
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, containing numerous external URLs pointing to various PDF files, some hosted on disposable domains. This suggests an attempt to obscure the ultimate destination or to distribute a payload through a chain of redirects.

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://bologen.ru/123?utm_term=trumpet+trio+sheet+music+pdf PDF link annotation
    • https://cdn.sqhk.co/jotenitix/hc5jg0z/anime_manga_wallpapers_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/nigalasiline/WyggvzC/golamodakogenamitisup.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/jBDgeRN/saladin_civ_6_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CKsihKb/40504930244.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/bzqojhj/metal_bat_one_punch_man_destiny_trello.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/3hvv3gc/93383716302.pdfIn PDF document text
    • http://voiprormul.xyz/dutamadojilexerovafovewsxey.pdfIn PDF document text
    • http://negozio50sconto.info/25409950258jh6q.pdfIn PDF document text
    • http://ccckkkkk.space/caballo_de_troya_3_alconetosvq5.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Cm9jfWu/13324013923.pdfIn PDF document text
    • http://filanion.online/landscape_photography_tutorial3jitu.pdfIn PDF document text
    • http://idealslim-ordina.site/86731101601vt5zm.pdfIn PDF document text
    • https://cdn.sqhk.co/muditazu/OjfihmV/black_christmas_2006_movie.pdfIn PDF document text
    • http://sis-paypal.com/46873890413qv1xc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_abde66b4d05443498628651343c21fed.pdf?index=trueIn PDF document text
    • https://8be317c1-93d6-4444-9a1c-030c84ae583f.filesusr.com/ugd/709942_8336850fa9584e23ab592d01595e47cd.pdf?index=trueIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_3fd5e1399fc5406493b4b4f65dee81fd.pdf?index=trueIn PDF document text
    • https://368af19b-b9be-4417-8ea7-dfc4611f9fec.filesusr.com/ugd/abd4c0_92ae2c9e5b3c4f6f8541916f222a6dad.pdf?index=trueIn PDF document text
    • https://691dfa98-c543-4342-b77d-a3d7fbf094aa.filesusr.com/ugd/d55835_ba384caf255e441984733bb8a219fc6f.pdf?index=trueIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_4219b71963c14bf4ae6de446f018d670.pdf?index=trueIn 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_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 5104 bytes
SHA-256: baa809c6026f7f7c23941801c8530a3c1ef76632f83838e52485dc5a90ef7523
font_01_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 10704 bytes
SHA-256: 58e86dc2aec16d96a4b5dcbce497894d50476a1d5ef16dd7d5cb654cc80f7c9f

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