Malicious PDF — malware analysis report

Static analysis result for SHA-256 f375f1a2ccff508a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 11:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2b4c0ac267c296db743aa9746e1be856 SHA-1: fac451b5d861059917b5c8cbc32ed94244a79c29 SHA-256: f375f1a2ccff508aec1a6d471aaebb33f4332fa4867cfb759c23e5494891cbc8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's designed as a link farm, pointing to numerous disposable hosting domains. The presence of external URIs like 'https://crysiq.ru/uplcv?utm_term=nulls+brawl+download+apk' further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=nulls+brawl+download+apk PDF link annotation
    • http://alt-1c.ru/userfiles/file/japowijiwuzoxexuvujabig.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/mujinodonitujidowurisada.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c07f80e07f09b15080928c92ac76c402/ranotexosibigimogifebo.pdfIn PDF document text
    • http://www.moyekolodin.com/files/ravenuniwe.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/96931380320.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/51877176098.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454c50ee2e1---nemivide.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/pajulazura.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/rorarezedejibije.pdfIn PDF document text
    • http://htcable.cn/d/files/wadilo.pdfIn PDF document text
    • http://cellfruits.com/ckfinder/userfiles/files/4110108567.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/51977702035.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/70374854290.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109180705122443.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/39352266819.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/panesetu.pdfIn PDF document text
    • http://skrn.cz/pic/file/96406752061.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/41042417491.pdfIn PDF document text
    • https://huanghecables.com/d/files/54304102582.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/1012898912.pdfIn PDF document text
    • http://szhlfz.net/upload/79844727908.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/medidixujasebixu.pdfIn PDF document text
    • http://warehousetraining.ie/images/dupafomejor.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/bosedezexazip.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/xidunuvegabatigemileli.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_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 10456 bytes
SHA-256: a3e89a95e4a283c1f7463858affdb06dbbf706ad41d25be623d5220314aeab7a
font_02_sfnt_off00011091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11091 17144 bytes
SHA-256: 23b476b47b9860fb8340f9623375e8bfa98ee380ecef94c53dcff3f3370f3616

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