Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f3d9e43d6ef7d4…

MALICIOUS

PDF

108.6 KB Created: 2021-04-04 19:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 52c57f1f8f5ec82a313aee009e3d6be2 SHA-1: 9b549067fff9aaecbc5897a13c6be7bfe3fb8c82 SHA-256: 21f3d9e43d6ef7d4cafa60420c3b9a6e661b31204847d0be4866ec258f7bc3a3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/strik?utm_term=stock+character+in+the+way+of+the+world PDF link annotation
    • http://sanelobazigi.medianewsonline.com/temperate_deciduous_forest_biome.pdfIn PDF document text
    • https://fakanodadix.weebly.com/uploads/1/3/4/3/134371587/papuded-goxadox.pdfIn PDF document text
    • https://cdn.sqhk.co/fanabezom/ahe3ijV/83144982245.pdfIn PDF document text
    • https://wozomeki.weebly.com/uploads/1/3/0/7/130776066/xinoxevi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375339/normal_6001f44b9d7c4.pdfIn PDF document text
    • https://cdn.sqhk.co/lukavago/ZTmjfFA/watch_ncaa_basketball_games_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wenudiwome/ohjaCsP/zidarut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384472/normal_6052fd6828139.pdfIn PDF document text
    • http://puvinizozibejir.mygamesonline.org/55687137778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_6043f5642a113.pdfIn PDF document text
    • https://vajasefa.weebly.com/uploads/1/3/4/4/134490273/6829605.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470028/normal_5ffda19b357da.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/8957c649-11ef-4cf6-bf81-7de2e0055347/how_to_setup_a_vizio_sound_bar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68891cc4-6513-411e-824f-c60f5b660d70/75044817715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4000369-bac8-4c21-b560-a9a06bbad0ee/95742193071.pdfIn PDF document text
    • http://zesafemumibow.myartsonline.com/tisaropogex.pdfIn PDF document text
    • http://nevabaza.atwebpages.com/bernardo_stamateas_gente_toxica.pdfIn PDF document text
    • http://wufagezigedo.onlinewebshop.net/ability_to_pay_principle_of_taxation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7f32c78-c370-4e13-af14-5f44fa5a691f/bodyweight_workout_routine_at_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c0b805-c8bd-431a-8984-39fe113b9fc8/nugipunof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fdfa05c-7752-401a-bc37-0bf4b86aa43b/vavur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2200fd1-a1a0-44c5-9d35-3f938008417f/gunijeramegixumebikezibuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c83fbec7-e622-4673-8b44-e9445636278b/23450391567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/515a7341-654b-4eba-a86e-282b59aac4b9/dd_monster_manual_expanded.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_off00015d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D68 5080 bytes
SHA-256: 9b9dd0cf04f3d51dbcbed105d7279fab1dba3b7b446ecec68178b4692a388896
font_01_sfnt_off00016eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EAE 11796 bytes
SHA-256: 5e8714683829bc0be275cf9521ed0f9a1be8b6e26b81f5e998f5ea6635e29613
font_02_sfnt_off000196c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196C2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2