Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ac350925b039e7…

MALICIOUS

PDF

78.0 KB Created: 2021-04-10 18:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7be868fea96b135ae22b45728ff37eb3 SHA-1: 7b7c95d7ba4daeafd287e2711f3fda8dd7dfbd8a SHA-256: 84ac350925b039e71346cfa89807c800edb4959a472c844b485fa7de012bdff8
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The ML classifier also returned a high confidence score. The embedded URLs suggest the document is intended to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=ps+form+2976-r+printable In PDF document text
    • https://cdn.sqhk.co/fudikeraz/5xk4jj8/backtrack_cs_go.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418985/normal_5fd30e2593706.pdfIn PDF document text
    • http://item-mask.top/how_to_workout_chest_with_resistance_bandst6kd7.pdfIn PDF document text
    • http://demask.fun/famonilelezific3heh.pdfIn PDF document text
    • https://cdn.sqhk.co/dipasupor/SGMhhBC/pofezozokasapeju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414334/normal_603d0682c099e.pdfIn PDF document text
    • http://setofexperience.site/craftsman_4x36_belt_disc_sander_partschio5.pdfIn PDF document text
    • http://xplaintome.ru/dovebowusawekip02ng8.pdfIn PDF document text
    • http://teenagetutor.online/mijijusuzosatilavolevujibavmx.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/ijSihje/train_simulator_dlc_cost_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/madilaxetevo/hajgBjj/pandemic_board_game_online_free.pdfIn PDF document text
    • http://wirelessinfo.ru/busulibevumetadajxi0x3.pdfIn PDF document text
    • https://cdn.sqhk.co/vomawoko/rYjeifG/144174431.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/14439ee3-e1d6-4dee-8609-485109a09e5f/how_to_find_a_wife_in_your_40s.pdfIn PDF document text
    • http://mojilobopage.rf.gd/bugolaxavotakojimisaniga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21164e22-a4c6-406a-93bc-19c83412a7ad/rodojuxan.pdfIn PDF document text
    • http://vezavajizuvos.epizy.com/tadowivefuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26b98f5a-952e-483e-9354-8b5ebd794bab/best_convertible_car_seat_safety_ratings.pdfIn PDF document text
    • http://telewazikenap.rf.gd/vusulefatikezuxixar.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC85 5740 bytes
SHA-256: be2da0eb5f99ec1d169941801cb441de4730b253d2b3750ee72a4961ceeb9612
font_01_sfnt_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 10872 bytes
SHA-256: 7166d98a41bb3cef9e3c024249f9db978c16fb11603ed6fcb4b08e8e35f744e0
font_02_sfnt_off00011572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11572 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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