Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1db3539862a95e…

MALICIOUS

PDF

115.9 KB Created: 2021-04-22 08:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 335ad5e4eb69fdfaa93d1123b55bc442 SHA-1: 29b4390c46f7e07666cfcc8ebb7f6ee893a0b4df SHA-256: 7a1db3539862a95e4fb1b6a985a32558af9f4263a4520d47d0009c457d207365
146 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The heuristics indicate it functions as a link farm and a callback phishing lure, directing users to external URLs. While no scripts were extracted, the presence of numerous embedded URLs and the nature of the heuristics suggest the document is designed to lead users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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) or Microsoft license-boilerplate 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://resalured.ru/strik?utm_term=banco+popular+de+puerto+rico+d%25C3%25ADas+feriados+2020 PDF link annotation
    • https://cdn.sqhk.co/jinubodilev/fmyjjgi/brabantia_perfect_flow_ironing_board_cover_size_b.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/mean_from_a_frequency_table_exam_questions.pdfIn PDF document text
    • http://curvepreloved.com/6474911474l8uez.pdfIn PDF document text
    • https://cdn.sqhk.co/xogiwusumo/k1jaifj/banner_design_templates.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482863/normal_60119a70b078e.pdfIn PDF document text
    • https://fowitukusizuge.weebly.com/uploads/1/3/5/3/135325135/4e2d25c927d4a3.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/who_owns_the_ice_house_chapter_2_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/jiiacih/super_why_abc_adventures_games.pdfIn PDF document text
    • http://sukuwodexi.scienceontheweb.net/27449529244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405644/normal_6066427f0716c.pdfIn PDF document text
    • https://pukogapuwobar.weebly.com/uploads/1/3/4/3/134307851/xogefavumubu-dufurajaraleful-jozefe.pdfIn PDF document text
    • https://cdn.sqhk.co/zamikukodef/iegiMif/wezirerijo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_6019804719acd.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/hdihjjh/straps_to_hold_sheets_on_bed.pdfIn PDF document text
    • http://ooovseanalizi.ru/stalking_can_be_defined_as_haven_answersswij8.pdfIn PDF document text
    • http://xibiselid.medianewsonline.com/ccsp_exam_questions.pdfIn PDF document text
    • http://kogemotuju.getenjoyment.net/how_to_make_pink_mixing_colors.pdfIn PDF document text
    • https://lulexabike.weebly.com/uploads/1/3/1/4/131407361/vagefamumu-xivegatam-modewa-pumig.pdfIn PDF document text
    • http://reliables.ru/5382266330f7sb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413120/normal_605064a5e96bc.pdfIn PDF document text
    • https://kawavaturitavo.weebly.com/uploads/1/3/5/3/135321378/2441049.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_602b614f63802.pdfIn PDF document text
    • http://tumbochka.space/68388126072csg9n.pdfIn PDF document text
    • http://grizhoff.ru/how_do_you_fix_a_stuck_auger_on_a_pellet_stoveg1xyy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15875 5524 bytes
SHA-256: 88fa8760c19527f27d0f1e24e1c2d98b3d856b65fa3acc38c93c669fa2b7e99e
font_01_sfnt_off00016b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B48 2644 bytes
SHA-256: b00c31cbbc19ec916f9e00bd33f1b401d05ec783784570d054a8c6fe17dd35ce
font_02_sfnt_off000176e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176E1 14952 bytes
SHA-256: 17ae209ae267d7d0a95cd5e6edef7665dffc9094d23381214cc6cf9c51e810e1
font_03_sfnt_off0001a61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A61D 17264 bytes
SHA-256: 5595456fca130517c974c32ec74c1e8ef64ce99229e665db04890be6aa4c1649