Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4bc04c3fccf8e3…

MALICIOUS

PDF

87.7 KB Created: 2021-04-05 18:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: daa31b6c1bb2dc7893e16dbd573efbda SHA-1: 1c3aa6bacfcdf8d27d291f00735b2113b70ba526 SHA-256: 4e4bc04c3fccf8e3424bc522509b2252ce0b742e24ffdbb39d447028cc44eb39
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/award?keyword=discrete+mathematics+logic+exercises+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447096/normal_5fe01f6cce9aa.pdfIn PDF document text
    • http://sluzhba1.net/stopping_by_woods_on_a_snowy_evening_tone_and_moodtt6oi.pdfIn PDF document text
    • https://zijobezugol.weebly.com/uploads/1/3/2/6/132682913/mefarabubito_vibodebegu.pdfIn PDF document text
    • https://pazaduzot.weebly.com/uploads/1/3/4/4/134473777/9330496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_6040baf0686cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476418/normal_5fcce3746f7a5.pdfIn PDF document text
    • http://kemytbok.xyz/biblia_peshitta_enx9jjd.pdfIn PDF document text
    • http://sait-ok.ru/command_line_connection_test4phfh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393900/normal_606166b1a60b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naratide.epizy.com/74347180316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d3229fe-ac82-4716-b17d-9b4d3a77f844/bodozizajivir.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/40127104815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/449d48e2-54ed-4f98-920d-ae962ee29c69/can_i_take_the_notary_exam_online_in_ny.pdfIn PDF document text
    • http://taborodadux.rf.gd/vivaldi_summer_violin_solo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8eb0f37-b84b-4813-b796-39a93fe90a8b/dns_320_firmware_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6add887c-e72d-4116-b34b-7b049267ccce/is_a_strong_electrolyte_in_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d62d0a-7811-4fe8-b27c-ec7119d3b3c3/91800549075.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/parulij.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/german_address_format_apartment_number.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/los_alimentos_transgenicos_ventajas_y_desventajas.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/cercles_de_la_forme_beaubourg_planning.pdfIn PDF document text
    • http://vimonaker.epizy.com/cantaloupe_island.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 5636 bytes
SHA-256: e95d5796996b31981f50ff50ebd7b439ebd0f7b330a4b4a3d70857478d06fbcf
font_01_sfnt_off0001127a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127A 11596 bytes
SHA-256: 7efda65d3be505ce3d485cc24a181bbb993edd6fe0a70afdfcc082fb7cc8ab26
font_02_sfnt_off00013a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A16 16580 bytes
SHA-256: f091f546292e76fa4f56367f1564537e44919f19bf3f874b1b949239ab02415d