Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5e20b22f159f56…

MALICIOUS

PDF

82.3 KB Created: 2021-06-03 05:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 87f90142502e5e6e1f73f445db05613f SHA-1: d10f23b141c60ccf9877d300df9c0f9b090ab2e5 SHA-256: bc5e20b22f159f56790f9211655926e2d704a631de853e65a9eb230109676f4d
186 Risk Score

Malware Insights

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

The PDF file contains a significant 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 related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/123?utm_term=extemporaneous+speech+guidelines PDF link annotation
    • https://vutakajar.weebly.com/uploads/1/3/4/8/134896426/niwumezazufexazov.pdfIn PDF document text
    • https://lukofobetu.weebly.com/uploads/1/3/4/3/134317857/b11daffe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375696/normal_602b0d95352cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458413/normal_5fcb6d706ea8b.pdfIn PDF document text
    • https://bisitewo.weebly.com/uploads/1/3/4/4/134496646/dowejab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490542/normal_5fe7abdae189d.pdfIn PDF document text
    • https://pegejajala.weebly.com/uploads/1/3/4/1/134109309/5159889.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/ebdb17bd-c83a-41c5-8853-b287509db704/rival_meat_slicer_1101e_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a69884-0ee8-4596-9b51-8c226c6f9c8d/ruwoveruwebiwegonovupogoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/051de82a-b839-47fb-abce-8a8ae2666e80/ridgid_wet_dry_vac_assembly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7d487b-431e-406f-b823-94f629cd427e/donner_lequation_de_la_tangente_a_la_courbe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f982518c-482b-4d9b-9b5b-ce3e9c90075e/3000_english_words_with_meaning_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5f7762c-fd21-4247-8595-b51772b911ad/59899121063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4829d5f9-1c61-4cbc-bdde-2aca65b2cf9a/zitepetomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e016b33-0e71-4d27-aaf4-956db3a842e9/sedenasovo.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144415368/71328391466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/837f757f-74f6-4568-bed6-6f2a6559aa21/chopin_variations_on_la_ci_darem_la_mano_op._2.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/w/file/fetch/144468747/2344696259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75e61140-8e13-41a0-b00a-8e962644af66/polatavaragiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88eb0a6d-8764-487b-93e5-5b09ebd8cfb8/zagurugikisijizorobazuxux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d35a70-7959-47c1-9a92-d07072004f9e/6409590676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca34b018-0813-4990-93e9-396e64a81cac/25948093355.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_off00010383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 5512 bytes
SHA-256: e0e5e425d576a58a344e8f5e6acee76a5bd6e3a3426986fd804a29e574514c3d
font_01_sfnt_off00011619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11619 10952 bytes
SHA-256: c5e1bdc8003a8215a9e75af83c89ae864f0fe42180cf52d1fa721193e5b946bf