Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff77fa83ed59e52…

MALICIOUS

PDF

92.9 KB Created: 2021-04-07 15:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 96b2d1c312f877c9ac8d0ffbb8d58291 SHA-1: 596a5725dcfcd0bffb98693dd6868d516ad3256a SHA-256: cff77fa83ed59e52eeee5019411e6da77998f5404b5970fa8ae7a7bc5235dda5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URL pointing to 'golowaki.ru', which is likely a malicious domain used for distributing further payloads or conducting phishing. The document body, though heavily obfuscated, suggests a lure related to a 'driver's manual'. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=nj+driver%2527s+manual+chapter+4 PDF link annotation
    • https://cdn.sqhk.co/zoluxoni/b6jgjeQ/animal_cell_culture_and_technology_butler.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476434/normal_5fe004b87c9fa.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/fhi41hz/ladavefepazewopufumuj.pdfIn PDF document text
    • https://cdn.sqhk.co/doxufojixene/djihj4N/800mm_drawer_runners_soft_close.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378608/normal_5ffa4df3651b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473645/normal_6063dc736533d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485702/normal_6039d253d35fb.pdfIn PDF document text
    • http://songkfrk.site/how_to_determine_level_of_care_substance_abuse92yj5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366381/normal_5fc6913aad421.pdfIn PDF document text
    • https://cdn.sqhk.co/sirojenu/K5X5hei/guilty_definition_synonyms.pdfIn PDF document text
    • https://cdn.sqhk.co/gumojitoxowu/aicx8hb/gowubojinodoxoditirop.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/17_indisputable_laws_of_teamwork_ebook23xw8.pdfIn PDF document text
    • http://veronaital.space/bozewireriterekajxqlsx.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/frz1jc9/lbs_to_kg_nursing.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/hjDihib/69103972966.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/ac8441c1-88a5-479f-9315-9afe14a49b49/75203607707.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/how_do_i_clean_my_air_humidifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c2a3473-d93e-423a-ab17-da30aaed75f2/onn._wireless_6-button_mouse_with_adjustable_dpi_button.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/troy_bilt_squall_210_oil_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b57ccda-2288-4ed8-84d1-67c4735f0c8f/soriwajibugidenilokobudog.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/el_materialismo_histerico_xavier_velasco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a54ebd7-8ae1-42a4-8ff6-587ada612674/are_heritage_gun_safes_any_good.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/apache_server_etag_header_information_disclosure_impact.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C36 5540 bytes
SHA-256: 5a48e126aeba5dc090ad207e376b2865a9902ceee7c8a81762301f5123b10c6f
font_01_sfnt_off00013efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFC 11648 bytes
SHA-256: b867ea18e4c958f344d78f898c45caeb065dd3cd10803187e4b79169899cbe1d