Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13a5601ef1e68a1…

MALICIOUS

PDF

105.7 KB Created: 2021-02-19 01:04:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0761a07b8aff55b0f0f04acaef43513f SHA-1: e87c43cf3da0bfcaa25af741dcfc83b61a9e5706 SHA-256: c13a5601ef1e68a134f6b2d1e88ea104f606ff88a585fd6200bc2d096420b62b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating an attempt to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=magnetic+field+due+to+rectangular+loop PDF link annotation
    • https://cdn.sqhk.co/vefuwebilux/ejcLgi1/pubewovabodebiburapagifo.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/hghajgb/98088260854.pdfIn PDF document text
    • http://callipakk2.site/353608615576asl7.pdfIn PDF document text
    • https://cdn.sqhk.co/vowobupubuze/gdVlMic/kosefadajiroluj.pdfIn PDF document text
    • http://leoidet.xyz/consumer_reports_most_reliable_car_brands_2010rqkju.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/biagigi/dunia_games_top_up_ff_diskon.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/bRc0hcN/birds_of_prey_trailer_song.pdfIn PDF document text
    • http://reduslimitalia-official.website/ecuaciones_diferenciales_lineales_ejercicios_resueltoscv1ng.pdfIn PDF document text
    • https://cdn.sqhk.co/fovomesit/heSELjh/radijazijar.pdfIn PDF document text
    • http://xigotev.iblogger.org/fluoroscopic_guided_lumbar_puncture_technique.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/xVLruhb/boderul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fadobirak/bucket_list_marathi_full_movie_2018.pdfIn PDF document text
    • http://refaruzevogot.epizy.com/pitu_app_chinese_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/alice_platform_glassdoor.pdfIn PDF document text
    • http://febatejo.rf.gd/53820067917.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/xobugaz.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_off0001447b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1447B 5152 bytes
SHA-256: 0104cc80fb912fac714b80b5518726ce8ed58e6becb13bc43c47a5d87a9d9139
font_01_sfnt_off00015620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15620 13352 bytes
SHA-256: c4319c583d05b4fb91d30b1dd11e3eaacd8abddb33a4bba808ab45f6412ceab1
font_02_sfnt_off000182f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182F8 16392 bytes
SHA-256: ebb47d85f673cb3ebf2b3dbcfd5b255b059623cfd6041c1e32f93eacfa9956d2

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