Malicious PDF — malware analysis report

Static analysis result for SHA-256 5774db45bb7586ff…

MALICIOUS

PDF

74.9 KB Created: 2021-05-08 03:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c94bb0ed395a79feffff1175ccebea2b SHA-1: df46507be5bfe7d8760402c299d36f336ef62deb SHA-256: 5774db45bb7586ff18082b468e683b73c0f106db61201c4f09ae78b2e44b0f80
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=big+java+early+objects+6th+edition+solutions+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/giravopakiw/jd705H7/linda_brown_interactive_story_mod_apk_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/e0Yjbgd/dinosaur_carnotaurus_attack_full_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469103/normal_60121708a6650.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461751/normal_5ff7585f7cf57.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/bjg5geJ/rigotivaferozelin.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/eIEhaLZ/88297013113.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/jejehc2/49335871388.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/gvgfOPv/exploring_science_9a_quick_quiz_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/6hfjhqX/gmail_app_for_macos.pdfIn PDF document text
    • http://nolonumufowarob.iblogger.org/82690538166.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://govujetimavex.epizy.com/chloroplast_structure_and_function_coloring_answer_key.pdfIn PDF document text
    • http://sajififavaw.epizy.com/24402346518.pdfIn PDF document text
    • http://xixupokolaxusuv.epizy.com/22113800504.pdfIn PDF document text
    • http://fuxewon.epizy.com/functional_requirements_specification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f2b6204-3467-4008-af22-aec1643260f6/jugataretarixexixov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fefd44c7-b9d6-49c0-aee8-3983d295785d/vox_free_vs_premium.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f354dc-fde8-4b30-a506-fca975dc6746/xurudir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a194b030-c3d7-4b47-b76f-f524c34a77a2/clark_forklift_seat_bottom.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_off0000cf9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9A 6152 bytes
SHA-256: 45ce8931bf5d8b588f8881aea5d64b645ad58a0d4b91f27e3b7b5e381baa132c
font_01_sfnt_off0000e471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE471 10568 bytes
SHA-256: dceb404f3428e98fd23b33a37344fe75eece89c533f05eda0d8649277c98764a
font_02_sfnt_off000108f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 16084 bytes
SHA-256: 29b8095464fa9501f2379a4c43ca3ba1b1df604f87f2abcbe11fa9bdafb8ec10

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