Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b52e48e2297a1a…

MALICIOUS

PDF

74.5 KB Created: 2021-09-09 23:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3ad47fdeecdeae844128610debed15b SHA-1: a608fa5b3adf4d0ad9316b0812b4240e2c75d092 SHA-256: e8b52e48e2297a1a4de13e48d12f2c77f4b021bbc0f4691ed577708ded6d7ff9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. Heuristics indicate it's a link farm and ML classifiers flagged it as malicious. The ClamAV detection confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wedding-box100.com/uploads/files/202109051636272928.pdf In PDF document text
    • http://teusz.pl/UserFiles/file/xebanalorejeponosizat.pdfIn PDF document text
    • https://esvigo.com/upload/files/zeduxutefawabidu.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/86640217175.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/ximen.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/17289215430.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/robimulosotejajosivamire.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/92553958727.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/65395192580.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/13838107196.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/27602709327.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/62811058857.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/24098282159.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/vimufiwifirip.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/17552240740.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/toxijovatikitavomofozu.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/dalotatowolezenamax.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/wekotedasine.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/kamobilalit.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/manibupi.pdfIn PDF document text
    • http://rafaelokazakov.com/file/tipibiwanuvapipuzud.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/wexifalotur.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/97007084065.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/44758548699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=is+68+prime+or+compositePDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/laguk.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_off0000c0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 16916 bytes
SHA-256: 1bd32c5fa5f9c734c5faac5737f240d5424a14b77ae67d118155a0113ea45828
font_02_sfnt_off00010467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10467 10552 bytes
SHA-256: 434d0750f303b0b0e3ab75dfe85f033d483bf97da45ad453f5b45d951451f0a0

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