Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a079c8262e5fdc…

MALICIOUS

PDF

74.5 KB Created: 2021-06-11 01:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0cf44140b8ae82d90cce0f1cb5ba978a SHA-1: aefc12e2b13b14f2aa78808ffd43526ca418a20c SHA-256: 79a079c8262e5fdc987c808c967f2990beb30fa90981fe46d220d7aea9f52c7a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The primary URL, 'https://medvor.ru/pbw?utm_term=online+video+to+audio+mp3+cutter', is presented as a tool but likely leads to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/pbw?utm_term=online+video+to+audio+mp3+cutter PDF link annotation
    • https://tutemedoz.weebly.com/uploads/1/3/2/8/132814241/jetavanuz-polezedalazor-rafane-gosew.pdfIn PDF document text
    • https://vidigewajo.weebly.com/uploads/1/3/7/4/137499811/wunid.pdfIn PDF document text
    • https://sejoxamopizava.weebly.com/uploads/1/3/1/8/131858661/wozatunugatasigalitu.pdfIn PDF document text
    • https://xowozasa.weebly.com/uploads/1/3/3/9/133999953/fb989d05694c911.pdfIn PDF document text
    • https://widetidutu.weebly.com/uploads/1/3/1/4/131453832/2300595.pdfIn PDF document text
    • https://tupinikuwexopej.weebly.com/uploads/1/3/1/0/131070806/7638053.pdfIn PDF document text
    • https://bixilojod.weebly.com/uploads/1/3/0/8/130813790/9110a1013e.pdfIn PDF document text
    • https://nubawobadeg.weebly.com/uploads/1/3/4/1/134131997/8543287.pdfIn PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/4508856.pdfIn PDF document text
    • https://kafijojiwagovi.weebly.com/uploads/1/3/5/3/135387916/8898367.pdfIn PDF document text
    • https://kezugavamatuwe.weebly.com/uploads/1/3/5/3/135347357/9500050.pdfIn PDF document text
    • https://xiguvopumodajux.weebly.com/uploads/1/3/1/3/131381006/f1f9c18733dd03d.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/74ec99be-ac22-4fbf-9c13-f0c8c3c9f10e/can_inbreeding_cause_problems_in_dogs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ded707d5-627f-4c6c-9222-34633fb8ef3b/dutaviguzofabugekado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd77a61e-58ae-4d5e-9252-956120273216/jovaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c90eaa96-5939-4a84-a12b-d0423cc59383/50393949550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a622287d-e125-41b1-9893-f567d3cbef03/walk_through_the_woods_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8adb21d6-f69f-4891-bce1-1328a2613e64/dutuwunojirurogem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce300b7b-46bd-4341-9d42-ad8c8010d845/nidabelor.pdfIn PDF document text
    • http://fosodijo.pbworks.com/f/what_is_comparative_international_human_resource_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae42eca9-3ca9-4401-8a0f-d8ac36f33329/professional_pitch_deck_template_free.pdfIn PDF document text
    • http://kafunujazuwo.pbworks.com/f/define_acidimetry_and_alkalimetry_titration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/978a98fe-cc5a-4a6d-966f-047a3ab33a90/at_what_age_can_draw_social_security.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccbf4883-eb7e-44e9-9b5d-3ea3e9ae3536/comptia_cysa_study_guide_with_online_labs_exam_cs0-002.pdfIn PDF document text
    • http://rorazokazog.pbworks.com/w/file/fetch/144983934/17611842881.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_off0000e663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE663 5292 bytes
SHA-256: 817a59628afdfa04bcb00a18476c87cdd2821a9e84f5e6de39af818d3fa10f1e
font_01_sfnt_off0000f853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 10484 bytes
SHA-256: a74ca1cb6aff173a2226c6ac3e3000f0b325b7e290bd7e16a21f5ab16653b31b