Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a745658d19b019…

MALICIOUS

PDF

80.8 KB Created: 2021-03-09 14:26:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 67a81aada6ff0b24bf74249d9416959f SHA-1: 89085a7eaf1f10a18c0d164aaf8e4bff1b0aa8ef SHA-256: 71a745658d19b0196b4e3aea396daa6dad2240fd60e26f21db47471fd0a96fc5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm designed to drive traffic or host malicious content. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wix?keyword=tier+1+interventions+for+math PDF link annotation
    • http://fowuwoxex.iblogger.org/porter_cable_router_1001_edge_guide.pdfIn PDF document text
    • https://natatujefeni.weebly.com/uploads/1/3/1/6/131607075/jadinagitomefo_sopamuji_rinubanak.pdfIn PDF document text
    • https://sobopagugakevul.weebly.com/uploads/1/3/4/8/134881985/d47270.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/jhbdjfj/party_city_promo_code_honey.pdfIn PDF document text
    • http://nelitip.22web.org/wasulugenexutu.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/jbjehcU/16622128398.pdfIn PDF document text
    • https://cdn.sqhk.co/pulununese/hdldn83/zombie_slayer_pantheon_rarity.pdfIn PDF document text
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/dd89cee952eed7a.pdfIn PDF document text
    • https://cdn.sqhk.co/kitobanifamo/PFShggh/canadian_western_bank_mobile_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/xobid.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/xowup.pdfIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_d72649b8b3a546b2bd31a7069405949f.pdf?index=trueIn PDF document text
    • https://ee67c5b3-b4d3-4257-b425-af55881d3a68.filesusr.com/ugd/c60da7_b99ee8c8a12c4331ad07019d52950d90.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f39b866a-a82c-49a9-9273-711915d967dd/subumisejeginefelazanus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d10c951d-a634-432b-8b8d-1122af820889/11888552667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59694436-d7d6-42fe-a4cb-be9adc4032f9/juegos_del_hambre_2012_pelicula_completa_en_espaol_latino.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/segudugujax.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/tipos_de_texto_en_comunicacion_y_lenguaje.pdfIn PDF document text
    • https://288dffde-0386-48bd-adba-b069b5f3b70f.filesusr.com/ugd/7e1b39_9b34ed7e0e0d44b8bb2e717528c436d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a6144e9-4e0c-47fe-ab78-557f90669389/life_application_study_bible_nkjv_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af135ff2-45dc-4459-b2d7-a667375729d5/how_do_you_make_beef_jerky_in_a_smoker.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_c300e6c508cf4cb789dac147d0be8f15.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 5036 bytes
SHA-256: b527233c8d0e1d1c92685542b269d9a06552f7a36897de08c846807b34ba329d
font_01_sfnt_off000111d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D8 10684 bytes
SHA-256: 459724972e5e12fb741f91ac5785f488d1845f279c86236fcf86629562417cb0