Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1962ce70790c9dd…

MALICIOUS

PDF

80.0 KB Created: 2021-03-22 22:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 38a985d2515dd9dc1b0307a744e40efd SHA-1: 900b9639e5d1ec4ecfe89b63e4ea42eac1dc8c3f SHA-256: d1962ce70790c9dd3b3feaec2bda92784dd5c3879e50a67efe6694df8b32e296
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it's a 'weight lifting routine' lure, which is then linked to external URLs for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/strik?utm_term=weight+lifting+routine+for+marathon+runners PDF link annotation
    • http://kalidejomepajo.scienceontheweb.net/commercial_cool_portable_air_conditioner_manual_cprb07xc7.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/lifelet.pdfIn PDF document text
    • http://leseweremizew.scienceontheweb.net/detailed_lesson_plan_in_filipino_grade_1.pdfIn PDF document text
    • http://nozumupi.medianewsonline.com/nuximumexuzitizade.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/83324822185.pdfIn PDF document text
    • http://pifowovumuwe.medianewsonline.com/91525540359.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/fuxuvonitaduvokowuxof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d70a75f-0da8-494b-a48a-3248a03995fa/crock-pot_express_pressure_cooker_csc051_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/871b2fd9-7bc7-4155-a985-497a7bfd6c1b/tukegajox.pdfIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_83dc26f611134bcca1fe8f92f771ca2c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/992c3b16-4df7-46ed-9bc4-d8396b78a767/27447723718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6183610-0d66-435f-863d-1dde4aff4f86/stealth_cam_g42ng_troubleshooting.pdfIn PDF document text
    • http://nedetezulofowi.epizy.com/excell_pressure_washer_2300_psi_6hp_price.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/dumusowe.pdfIn PDF document text
    • http://zonafikepejese.onlinewebshop.net/siwumudifad.pdfIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_c6f03897d4ac4f35890dfca6ef859da6.pdf?index=trueIn PDF document text
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_5e1d275b54e2474997761ada848a1609.pdf?index=trueIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_07eee80f528645b0a512d565d84dbff3.pdf?index=trueIn PDF document text
    • http://bunalatar.rf.gd/77106593619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a4ad30-2806-4f17-9cee-1bc074df766c/95018358898.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/65246901278.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/cengage_chemistry_books_free.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_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 5196 bytes
SHA-256: 03945c0b5ff19aa31ecc98e85fd1defaefd3c5cf3a91791fe5d0a79b0d5e0aef
font_01_sfnt_off000101ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AC 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A39 11164 bytes
SHA-256: 839220d5aadabd31ba1629a2d99a3eb06285d8025ed170711cf27b0b9c2e7ec9