Malicious PDF — malware analysis report

Static analysis result for SHA-256 930a923399a94812…

MALICIOUS

PDF

71.2 KB Created: 2021-09-18 13:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 60f81355668cb0dcafc869793ef22187 SHA-1: f7d656e6674434d23034d609e863955be5275597 SHA-256: 930a923399a94812c73c444055a39b6737a685097a18af5c46649aaee45d2b6d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farm characteristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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://chcial.ru/uplcv?utm_term=ps2+games+download+for+android+mobile PDF link annotation
    • https://network-italia.com/file/gaxizug.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/4443107601.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/kuxirosotigobosud.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/82944897717.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/nebokodugujekevi.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/14857444144.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/nelifopavituforuz.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/pifununu.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/kivuxav.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/86233477396.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/24106393159.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/70328631109.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/49396999601.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/fuwunosuje.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0946340001631697543.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/xoxonizirajarakuw.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/25127845547.pdfIn PDF document text
    • https://digireg.li/upload/19771065443.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/37312635925.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/joxijivaku.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/93169326322.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/finojeno.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/wujaxixit.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://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_off0000b472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB472 16552 bytes
SHA-256: a5868e3a6252f000085cf171ffc0f10c5a044b13ef91c2de21f75977345f2433
font_01_sfnt_off0000dd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 10948 bytes
SHA-256: c90794a3cae7921dac98fc0eb704c4286cbdff59117f51407c06955d5611d89e

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