Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8be351a4895a30…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 05:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77c0a0c056eec6b044376d593dc0de32 SHA-1: e82143387b1cc74fd220fdd1a9fe4d7701e3e4a2 SHA-256: 0a8be351a4895a307e45d8dedcac5e7c00aa58fe03eb6c3acf640cae7514ab41
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. The PDF's structure and the presence of external URIs indicate an attempt to direct the user to malicious content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5961

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 http://wanyuantemple.tw/userfiles/file/rarukulurizoragubal.pdf In PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/vesazubesegisalanizuk.pdfIn PDF document text
    • https://paperland.bg/uploads/file/34034295657.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/11292907290.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/lukulurinovevovaso.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c09d4debdd25fa7ba24c56222d91b5df/nejebowogumajepofa.pdfIn PDF document text
    • http://koddous.com/userfiles/file/57210994406.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/niterub.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/wikigubodelagupo.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/vubalerolafe.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/gojumejivawizolafoni.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab644bac3---vobinizabinokekelabetu.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/livalimexekurobewutajara.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/65828797857.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/86842531533.pdfIn PDF document text
    • http://zerosquareonline.com/file/nezononusisukojizakizega.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/gigusuv.pdfIn PDF document text
    • http://jatransfer.com/userfiles/file/fasubafoliz.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/81773430919.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/bitiwubavi.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/61134579703.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/jomibizuwimoxujarukode.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/96337377497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=create+pdf+bookletPDF link annotation
    • 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_off0000dda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 10392 bytes
SHA-256: e801de49a880d81fb8ffb89ac97a23ed215b470b567badea0e6b3c988ae3d797
font_02_sfnt_off00010d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D27 17852 bytes
SHA-256: e3ed89bf000c4e01ed9658a9136a6730004c4857ee56c8a467a34dcff227dbf9

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