Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18be82a7168f202…

MALICIOUS

PDF

73.6 KB Created: 2021-06-10 00:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1174f73848b66eef7a90680ab0132728 SHA-1: 45e91e38053c39ace460b0dcc7f0df49c6a6d4fc SHA-256: d18be82a7168f20245c795a5b3b62e9996cd972d55d557a499114bf87d06343b
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links pointing to other PDFs hosted on various disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://ketchas.ru/pbw?utm_term=comparative+degree+of+beautiful PDF link annotation
    • https://kawavugin.weebly.com/uploads/1/3/0/8/130874435/81e77dcfc082e.pdfIn PDF document text
    • https://kaketoxemi.weebly.com/uploads/1/3/5/9/135989659/xuvivunisev.pdfIn PDF document text
    • https://zigikarorusoto.weebly.com/uploads/1/3/5/3/135351373/fozizunovusa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379618/normal_5fe3c088b03b7.pdfIn PDF document text
    • https://razixolinatu.weebly.com/uploads/1/3/4/3/134384461/nelojerenunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_5fd644f5bef00.pdfIn PDF document text
    • https://vazoxavaver.weebly.com/uploads/1/3/4/8/134863882/5012274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454170/normal_605f6702c62a4.pdfIn PDF document text
    • https://gewuzonaxos.weebly.com/uploads/1/3/4/7/134714103/wunorasupu.pdfIn PDF document text
    • https://sinidagiritab.weebly.com/uploads/1/3/5/3/135386058/e82d5630f7.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/5286109.pdfIn PDF document text
    • https://jurogewogil.weebly.com/uploads/1/3/4/3/134318518/roxijifolikubab.pdfIn PDF document text
    • https://pofimutazotoxo.weebly.com/uploads/1/3/4/0/134000188/daverekukez_xagaraxi_lexesixed.pdfIn PDF document text
    • https://zomatofaso.weebly.com/uploads/1/3/4/6/134633851/suzejijovipufisobe.pdfIn PDF document text
    • https://wosumugip.weebly.com/uploads/1/3/4/8/134867897/2295455.pdfIn PDF document text
    • https://gitapelo.weebly.com/uploads/1/3/2/6/132682700/pozibovalomamasewet.pdfIn PDF document text
    • https://goguribepolim.weebly.com/uploads/1/3/0/7/130739596/af1b61d2db42163.pdfIn PDF document text
    • https://xitawameduzip.weebly.com/uploads/1/3/4/5/134511141/700b7abe64b916c.pdfIn PDF document text
    • https://lezojefob.weebly.com/uploads/1/3/5/3/135319065/7782552.pdfIn PDF document text
    • https://wowiwega.weebly.com/uploads/1/3/1/4/131453904/7121106.pdfIn PDF document text
    • https://bimuxafidiw.weebly.com/uploads/1/3/4/7/134701061/8adca22f99.pdfIn PDF document text
    • https://nitelozam.weebly.com/uploads/1/3/5/3/135308565/376426.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421056/normal_5ff5248c14ff3.pdfIn PDF document text
    • https://makaxifosezopuv.weebly.com/uploads/1/3/4/5/134511124/8344153.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65E 5184 bytes
SHA-256: 2221bef74ed01adf3d1afffa102b6cc76797240103fc0f8720a0f3fa2b659c31
font_01_sfnt_off0000e810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE810 10024 bytes
SHA-256: 6f282b77f6e162caa526c5699f8f164d4257e6f247e56477695204ce801f9b51
font_02_sfnt_off00010a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A51 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361