Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9c972819b9bedf…

MALICIOUS

PDF

75.5 KB Created: 2021-09-11 22:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eaf69185edadf406b405aeb784768c69 SHA-1: c7bb1593d1e4467c1ea0cb54fa368aa2b99bea27 SHA-256: 4c9c972819b9bedfdbdf1727425f2ca61b464b834ca1a79b8fc410849adfd0f6
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged as a link farm. While no scripts were explicitly extracted, the presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://dotykbylinky.sk/_subory/subory/guxomiwi.pdf In PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/jilipidewiwulesanamode.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/23632574540.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161330e90decf4---kenovosigumamulisatifabuk.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/3896937587.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/bunirerow.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/gebevijukatanukeludaju.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/63510675619.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/revogitimozoro.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/medozixo.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/kusasovepidabolexar.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/84011498782.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/degijewopovukisidipebati.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/kovesutomabu.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311313da75c---87046560667.pdfIn PDF document text
    • http://artospace.com/pics/file/79025081313.pdfIn PDF document text
    • http://aa-nusd.jp/rowetozuxegumufixa.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/15182750975.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/12822489935.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630640592.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/43868561185.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/1295030325.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/nigowowipabozovinuximad.pdfIn PDF document text
    • https://camelcarpet.org/d/files/pewerujamuzopububedupifi.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/95237629971.pdfIn PDF document text
    • https://computerzone.pk/file/wobetijojano.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/46586307644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=bus+simulator+vietnam+mod+apkPDF link annotation
    • 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_off0000c509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC509 16436 bytes
SHA-256: 4a539bb205d7d851b4b40d407eecc810b4cdb00ccd790171e09f4833fd21a68f
font_01_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 10864 bytes
SHA-256: 58a18c36c6643461dd2dcde2ab7bbb7cbf4a330a199f78d113ac0e1badddfd00