Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e135fba1818323…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 06:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f57adb8a3f398baff518b972aeb87bed SHA-1: b5f057fe996dff1f0541493f56e676502bf545c8 SHA-256: 31e135fba18183232cdc12781d64bf6091c119251ff0508d5127f0092c5b10e3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URI links. The PDF contains numerous links to potentially malicious domains, suggesting a phishing or malware distribution attempt. The embedded JavaScript is likely used to facilitate the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://oniceh.ru/uplcv?utm_term=goetia+the+lesser+key+of+solomon+pdf PDF link annotation
    • https://noursportevents.com/wheelmarine/userfiles/file/11300464380.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/kovexudakalexage.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091004043530170.pdfIn PDF document text
    • https://trexanh.net/upload/files/22153652130.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/mekovelifefovowatodedu.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/tupizokanuwage.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/38445023166.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/44777846457.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/86793168286.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/favusegopisojuz.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/ximujunabogenapurexevo.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/47892376612.pdfIn PDF document text
    • http://elskenecologie.nl/files/39011768258.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109051434311364.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/83443897762.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090417542466804.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210911_6501309E7529AC10.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/kiwezogevunizesovuxiz.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/93061163848.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/95539606718.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210910150603.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/tevusobuxulozuzifubufuki.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/riber.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_off0000ddb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 20092 bytes
SHA-256: f6c991521be69380681404321dd10c8b9d40b8ca4091d0f21375542a1ecdf754
font_02_sfnt_off000129ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AD 11008 bytes
SHA-256: 0efa290ed8c4e7fd8c236094879420279b2ac342e71a701ff9be31fa877a94a8

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