Malicious PDF — malware analysis report

Static analysis result for SHA-256 d408559cbafe4f24…

MALICIOUS

PDF

95.9 KB Created: 2021-04-29 22:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8015956aae7b71b5d2a763e0064f36e4 SHA-1: e01cb3c1b450872597a25798e571aa5e4611a36a SHA-256: d408559cbafe4f2400adeccc0f49a9efbdb873a414f4eee5e2528a78045a1e97
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically pointing to 'golowaki.ru/strik' and including a 'utm_term' parameter suggesting a lure. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent. The presence of a link farm on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://golowaki.ru/strik?utm_term=pathfinder+wrath+of+the+righteous+companions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378165/normal_602d6b736b678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464877/normal_60207cd700590.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377909/normal_6008c07200284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_6062d62173d6a.pdfIn PDF document text
    • http://rixujewo.getenjoyment.net/bhagavat_geetha_in_tamil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476127/normal_5fdee75bb4e42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_6048648e5a4f5.pdfIn PDF document text
    • http://pimesizawox.sportsontheweb.net/ford_mustang_shelby_gt500_cost.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501810/normal_602678935f5ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474192/normal_604d71afd86b0.pdfIn PDF document text
    • http://wovugikanagak.scienceontheweb.net/angle_of_elevation_and_depression_trig_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406516/normal_5fd8f9e4c12c4.pdfIn PDF document text
    • http://kogemotuju.getenjoyment.net/magick_liber_aba_aleister_crowley.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469638/normal_5fe2bc615c157.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446380/normal_5fed9c712b5e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476275/normal_606608c4f2116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421365/normal_601dfafbeb813.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2970c1a-62f8-4689-9632-178e88c7e912/classification_of_engineering_materials_nptel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edcb5f59-a1e7-4b90-9e65-4a75a663b801/shark_handheld_steam_cleaner_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6b9f44-8248-48f1-a8ff-8803bc9c74eb/10680351900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62db067a-b3a9-497c-8d56-6806d319903c/86486910740.pdfIn PDF document text
    • http://sinusudixuxuwad.atwebpages.com/31419986681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86dde0b3-6bf1-428a-a6fe-8004cc0980e4/rupixutenarofuvopusado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add855b6-ea0b-4621-911c-193095833fec/what_does_tenth_mean_sentence_commuted.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92e0553a-a685-44ae-b1e7-381fd1fed058/mamoxevu.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_off00013500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13500 5628 bytes
SHA-256: f1f9cbf7e4842e9cdb437ebcf55e33ef7e91835161ec4e5ec240d72e08aeef36
font_01_sfnt_off0001481a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481A 12264 bytes
SHA-256: 0d860113df62fa1deeb7f733a5e1767383c32e59ed5dc7d7d2a93e7c14e7df2c