Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36ef5774b30a3eb…

MALICIOUS

PDF

81.8 KB Created: 2021-06-01 03:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 21752b9802d7da2214aea26be19fdab5 SHA-1: 3140cfbe672f21bb1081b08ef433e91349e6cd97 SHA-256: b36ef5774b30a3eb07caaa57342553fe94dc9b983206a6681eec1bda3a820a2e
206 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to other PDF documents. The ML classifier and ClamAV also identified it as malicious. The embedded URLs suggest a potential phishing or SEO manipulation scheme, possibly leading to further malicious content or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://archism.ru/pbw?utm_term=equifax+data+breach+senate+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414166/normal_604f176588932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_6063ab4a24678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499999/normal_60568e78a33d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463279/normal_600fa3c252f64.pdfIn PDF document text
    • https://mekujukoner.weebly.com/uploads/1/3/4/7/134715553/zuxebevo.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/7406156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464870/normal_6056e381dbee4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464077/normal_5fdb8b966689a.pdfIn PDF document text
    • https://jimepozuzaz.weebly.com/uploads/1/3/5/3/135350414/lurogo-dogadogum-zapajepunulibir-jipafepegovofop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388163/normal_6024fd1944e79.pdfIn PDF document text
    • https://jazoruwaru.weebly.com/uploads/1/3/2/7/132710784/nusewej.pdfIn PDF document text
    • https://fusikejasuk.weebly.com/uploads/1/3/0/8/130874124/konol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427501/normal_60364ba231587.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8c05aa81-4275-4e96-b9a8-90846b2ad1ce/libro_dioses_y_heroes_de_la_mitologia_griega_gratis.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/zisoxubujezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ecbf43a-8eb0-4146-944d-6a49d5a120e0/hearts_of_iron_3_war_tutorial.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/f/gizenewamupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/410a0d53-2697-4a33-b45b-fca97bc1620e/world_war_z_game_of_the_year_edition_upgrade.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144428739/96535859996.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/f/linagolejebogofilotam.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/spoken_english_study_material_free_download.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/w/file/fetch/144425859/noretakikinaj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 5384 bytes
SHA-256: 6253d0cd69e21693613b7c159f4acd6ad518a8a080132ff7e829eb49737b474d
font_01_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 11116 bytes
SHA-256: 89120515afdae0da9e7a1783711feab3939a55499e65a59f132a8c7c3f862cc0
font_02_sfnt_off00012bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2