Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef83923835b6cf8…

MALICIOUS

PDF

81.1 KB Created: 2021-03-31 16:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 942bc833b406addc7064d37f23f1bd2a SHA-1: aa0e004f7717322ff9b4bb90499fdf829244f3da SHA-256: 6ef83923835b6cf89ee266bbf32521933808519eff1533a647335440b0ddecb6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute further payloads. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/123?utm_term=creative+resume+template+ms+word PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392868/normal_6059eaeeeb68e.pdfIn PDF document text
    • http://nakrutkavk.site/elementary_differential_equations_william_f._trenchw8sff.pdfIn PDF document text
    • http://khareedforosh.com/what_is_applied_mathematics_in_computer_sciencezen74.pdfIn PDF document text
    • http://kugaraginoja.mypressonline.com/ketoprofen_adalah.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485578/normal_6057da84695d5.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/budifafuvasipimugon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454825/normal_5fd09d555ff32.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/zivupadenox.pdfIn PDF document text
    • http://trokot-online.xyz/craftsman_16_inch_electric_chainsaw_replacement_chain3abx5.pdfIn PDF document text
    • http://rusherx.studio/jungle_tier_list_proguidesdfdnm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_605b6b590ec89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479240/normal_60268c8fc71cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_6fed716c307f4869b3f641cf12e7502a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce42ba02-7b29-4647-a074-2fbfbeb710c2/3760874979.pdfIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_9928f6d2aab14d028e702ecdfe975d30.pdf?index=trueIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_17cdda85d2494809a9309c5475018717.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa78a02c-c12e-4314-bd60-b80bc2ce4c43/78918681603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b11d22c-1ddd-4826-af4d-ae4e19da8dee/pit_bike_racing_carburetor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b8e14a-ffbe-4d57-8022-d76dbb5001ac/family_counseling_near_me_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba918733-91c9-4cd3-ad01-8edba6538102/kaduvadopika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1904fb07-e1d3-4d81-914a-c2b474e00518/womens_bodies_womens_wisdom_2020.pdfIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_81a412d131264e7eb4c0001c6a919026.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b4711d7-9a58-4eb3-be62-793a246d9e04/how_to_learn_sketchup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e5a50e-cd70-4b95-8b33-dad19dac2715/kukukirowoxaburex.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_off0001018d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 5164 bytes
SHA-256: ae82746e0f33fdb008e17bc8b02401e9e1b2a8756fdbb061e17c737791a702a7
font_01_sfnt_off00011316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11316 10308 bytes
SHA-256: 74537961926f4704d87bc88c04a337e43ca0c03129930f34c237dd02a64cbb71

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