Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bb31c3301668a8…

MALICIOUS

PDF

64.1 KB Created: 2021-03-02 10:30:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6b89164513edd3f09c2936f9cf1a2aba SHA-1: fed83b28657a2b9d46beb0bc5eac0d2502d94992 SHA-256: c4bb31c3301668a87501f4973b7338874bb03d83f24caada4df31620efab0516
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs pointing to disposable domains and link farms, suggesting it's designed to redirect users to malicious sites. The presence of 'game killer apk download apkpure' in the document body and URLs strongly suggests a lure for potentially unwanted or malicious software.

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://dugedepap.ru/wix?keyword=game+killer+apk+download+apkpure PDF link annotation
    • https://cdn.sqhk.co/balijanawi/gjWuFhb/88521342105.pdfIn PDF document text
    • http://powogole.iblogger.org/what_is_self-knowledge_with_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455180/normal_6010952e9c291.pdfIn PDF document text
    • https://cdn.sqhk.co/katutilit/sj5vhdM/64108335524.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/uncle_iroh_is_the_best_character.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/idggxhg/xonixod.pdfIn PDF document text
    • http://kinopijoxiboga.iblogger.org/critique_of_pure_reason_immanuel_kant_summary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xewowibaxe.rf.gd/ar-15_upper_receiver_proof_marks.pdfIn PDF document text
    • http://lowebabufi.rf.gd/hungry_shark_world_mod_money_apptoko.pdfIn PDF document text
    • http://dufexisoji.rf.gd/video_gallery_website_template_free.pdfIn PDF document text
    • http://bikilut.epizy.com/manhattan_prep_gre_guided_self-_study.pdfIn PDF document text
    • http://xaguxebijop.epizy.com/rated_r_logo_template.pdfIn PDF document text
    • http://wigebinijeg.epizy.com/punctuation_worksheets_high_school.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_off0000c1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F7 5116 bytes
SHA-256: 567a61536c6510c7f7870b153d842690f63747954acb1c2bcbfef15181073cd3
font_01_sfnt_off0000d35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35C 9496 bytes
SHA-256: 7bb605118626c1fd455382206e0829e7c21f8f15670f2e3eb78fe97de7a0ce04

Open this report in the interactive analyzer, or submit your own file for analysis.