Malicious PDF — malware analysis report

Static analysis result for SHA-256 bedc8490c469215f…

MALICIOUS

PDF

81.8 KB Created: 2021-04-16 20:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 06112059d935c332c9161d50e462485b SHA-1: b55bc304a1cb6901c01ae9abfdbdaae5d59edb02 SHA-256: bedc8490c469215f8e4093973900df57283e20bcb10a56f03d20e4f814e11ed1
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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/strik?utm_term=how+to+set+temperature+on+ritetemp+thermostat PDF link annotation
    • http://meetchambre.xyz/zorosimenojozikuxol0wa5j.pdfIn PDF document text
    • http://cashthe.ru/sentence_structure_examples_higher_englishg1ehm.pdfIn PDF document text
    • https://kujepilam.weebly.com/uploads/1/3/5/3/135343620/sebadusofami.pdfIn PDF document text
    • https://cdn.sqhk.co/fematixub/7ggjg8G/funny_guy_halloween_costumes_pinterest.pdfIn PDF document text
    • http://agent-ritual495.online/creative_outlier_air_manualmnd61.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/i1xdhdp/zurumaforofesetujusixakod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5fdbd12d30d66.pdfIn PDF document text
    • https://cdn.sqhk.co/takabalal/hf6DPja/paper_and_leaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482638/normal_5ff87f2522209.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/geGDjij/cat_has_runny_eyes_and_stuffy_nose.pdfIn PDF document text
    • http://lynciguest.com/one_goal_sports_spring_soccerzog65.pdfIn PDF document text
    • http://finansi-7.online/zed_guide_op_ggczfwv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_606d5e0e5ab9d.pdfIn PDF document text
    • https://vuzeruferule.weebly.com/uploads/1/3/4/5/134591890/wetilaxedafero_periwififot_tixetonuluzodep_refonatanuzisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372383/normal_5fdb76acbb02c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_604d203fc31d6.pdfIn PDF document text
    • https://bubunixijasebed.weebly.com/uploads/1/3/1/4/131407035/573fdbf673dc278.pdfIn PDF document text
    • https://memabalizova.weebly.com/uploads/1/3/4/4/134490842/gidul-wisov-bizos-sovololukosok.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://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_3f9b12fa1a464416b86c1cc49a75a47b.pdf?index=trueIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_173c80cb33514c1fa4f159c29e973d1a.pdf?index=trueIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_7b088f9f96174ba2b2ec1f464e6a4902.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a0ba17-bd64-48d1-9a21-9c23fd21a745/wilifabunenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16db1543-3b1a-4140-87ea-1c8dc5a856cb/21057874712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/405ad01c-07f2-4bbf-a03e-19de57d80f83/gajukobugirasumudagodito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac15e7fe-a198-4721-8c0d-f22db914ba3b/number_1_umbrella_academy_actor.pdfIn PDF document text
    • https://7dad073a-5858-4d13-bf35-a645d3acb044.filesusr.com/ugd/71e439_5d7de8a6adab40e68c32d35f4dc2d28e.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_7dad25212b184d4a89d11cec039e4a38.pdf?index=trueIn 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_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 4964 bytes
SHA-256: 7088790dc6e00d59ee76a9a9468e78284d9c8aeb4b71bbbfe4ea24e1c2a75352
font_01_sfnt_off000106a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 10712 bytes
SHA-256: 9c2c4f7d305f2470c3a0f1d20ad6cb6749d1362a20f5afb5fde53badd5cbe86d
font_02_sfnt_off00012b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B41 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e