Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2af6e2883f9eefc…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 00:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8771f38d35ac6645a60cb425211db29d SHA-1: 33ef4e02565127068ef38ce0736cac5e235f4757 SHA-256: c2af6e2883f9eefc0fff4b68f35c641ca18bb1ba74560b6b63ad011e85b41e6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The document functions as a link farm with numerous external URLs, many of which are associated with disposable hosting and UTM parameters, indicating a phishing or malware distribution attempt. The presence of multiple external URIs and the link farm heuristic strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=redmi+k20+pro+update+miui+12 PDF link annotation
    • https://successalpha.team/upload/files/92565670807.pdfIn PDF document text
    • http://imaginove.eu/data/Files/2011505234.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/zodakitagiponuzaviwasuzet.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/68624910108.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/71060053041.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/menubovafupixelarupejex.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/3495291888.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/3432262419.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/sipuxiwaj.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/e07e9bf78c3fb94557240ea55cc51026/rixujaraxutigaf.pdfIn PDF document text
    • https://greenways.at/userfiles/file/zonesuda.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/judijomibolepidilaketi.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/kebakekimo.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/kefutegovo.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/88313062187.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/nenosujojumutaledo.pdfIn PDF document text
    • http://qwerty.pl/_data/file/38178224554.pdfIn PDF document text
    • http://kes.org/upload/editor/files/bizaxefewinane.pdfIn PDF document text
    • http://grupophi.es/uploads/files/48214968851.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/wibiniboxulu.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/70439260124.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/winulotokuxevigak.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/77728136529.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_off0000b13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13D 15052 bytes
SHA-256: 7cc603feea5355174a88903c4d04b0296f84848116e0c7e0717b153c7242b748
font_01_sfnt_off0000d73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF55 10764 bytes
SHA-256: ab275cafd7bcb889e757bb20fbc5209b1ee740870ee7c990c42ba51d0eb0de62