Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d3e54db9f964c8…

MALICIOUS

PDF

69.1 KB Created: 2021-10-03 06:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8315ec16ba19e3e3047154ac87b1c4ef SHA-1: a9553619501b19e542317dff156da75de2e4605b SHA-256: d9d3e54db9f964c8ed5370c76fccd4199c83973661b9dc1d1243fc5240aa5a7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern involves redirecting users through these links, likely to phishing sites or to download further malicious content.

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://crewmak.ru/uplcv?utm_term=today%27s+horoscope+with+lucky+colour PDF link annotation
    • http://studiogiamberardino.it/userfiles/files/50741188967.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/bewovesalirisetaxij.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/85882794971.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/xezon.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/gilusak.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/vadafezalaludunupamu.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/benolalilozep.pdfIn PDF document text
    • https://path.mn/userfiles/files/kogon.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/91956145028.pdfIn PDF document text
    • http://apicn.net/upload/files/jemagagafeleso.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/31269571335.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/20759683975.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14328527614.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/wojoxarum.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/dedejavazinuvabulezu.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/1964586455.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/zorenukajeji.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156be910652e---sotefokajenidunukivib.pdfIn PDF document text
    • https://okul.gencreklamajansi.com/uploads/files/17877524019.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/db485b82b129604be1805f0e9547fef7/81183470415.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20211001/16330225033940.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/simekodalumefudilavige.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/rutikutanunususabup.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_off0000b0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DD 14440 bytes
SHA-256: dcec2a332cac3046d9ce4c68e9ae5a3b91a9d0127fd5942c350531b2fb145035
font_01_sfnt_off0000d52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 10896 bytes
SHA-256: 721d774c94099338a53ff9582fc6628ec984bbb39eeb8a3688f28974c473006f

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