Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bf26e37868ab0b…

MALICIOUS

PDF

79.3 KB Created: 2021-06-05 19:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d6d37e1a36102f581f5f4e5266691ce0 SHA-1: 5fa2757d3b4d17badd4f311d4c0a1ffd53513d97 SHA-256: c6bf26e37868ab0b9b1e3692c6cb6e419515e1b7e7528a3db5dc06e8f31c5e99
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable hosting services and utilize UTM parameters, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM confirm the nature of the document as a malicious link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://drafthe.ru/pbw?utm_term=capitalismo+solidario+libro+pdf PDF link annotation
    • https://rusapaja.weebly.com/uploads/1/3/4/6/134617617/jojat_didub_kufojine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_603c1e34aa3b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_601b193b441f9.pdfIn PDF document text
    • https://pupamunapuk.weebly.com/uploads/1/3/4/6/134617401/b99699.pdfIn PDF document text
    • https://pilorixo.weebly.com/uploads/1/3/4/6/134689004/dd867289.pdfIn PDF document text
    • https://wadasazaba.weebly.com/uploads/1/3/3/9/133999184/filivaxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478687/normal_5fe4c8ab1045a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382613/normal_5ff20be6b4735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428335/normal_606260bbed729.pdfIn PDF document text
    • https://nefikeroliv.weebly.com/uploads/1/3/1/4/131453179/mamin-joxiza-palelubokakivu.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4388276/normal_60b03feb0d735.pdfIn PDF document text
    • https://puzalanenezow.weebly.com/uploads/1/3/4/6/134693659/ac6e12485e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449998/normal_6039c6bf0b3bf.pdfIn PDF document text
    • https://wojatobarub.weebly.com/uploads/1/3/4/6/134612389/diverizukiwebeke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404488/normal_5fcf9608db543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501028/normal_60280b600f2ca.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/97a5e1f1-0fb7-4531-84fb-9cb0c0bc2714/70022957270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6e599df-a31f-4aeb-8ecf-5c5305259e0a/rodunarek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f80ca72-07b2-42d7-9775-756e507bfc97/kofazadigowofowaxejumafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47017749-8ce6-46b6-b017-aefb13528663/dell_inspiron_n5010_charger_90w.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d5c1af-7ff7-4c51-b5f3-f39de8ba366e/55536774618.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0015cca4-2488-4e91-a712-6616e0eb2838/oster_duraceramic_6_cup_rice_cooker_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b9f53e5-7f52-4601-99bb-a82affa467d2/sezodejesawewotenasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b197cc4-8c3e-421b-a57b-fabd3ef17d4f/65451492583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b29d9e-f581-4d60-bc20-fc5d55761b08/download_alvin_and_the_chipmunks_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0af59de-3c87-40e8-ba93-22aeec8d50e5/horse_rug_temperature_guide_australia.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_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 5232 bytes
SHA-256: 1085db838a5ede293d0b03fdca1f8e73d4ec17e312c413d02faba7bf4bc80eb6
font_01_sfnt_off0001071e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071E 11812 bytes
SHA-256: ae26edd467376e66f5b5b137138db988944cd3878e1eb9c9e9a67e451df9ae2f

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