Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddaf8d73053d595…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 15:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4845c1bcedc3b44e99302705eee5efa SHA-1: b0663ff984e68b5c06ded0f5200b8f7a23eadaed SHA-256: bddaf8d73053d5958c696e1b541fc4177e0e8d3651f57a57ed78e53fb7ffe887
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further malware.

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://archism.ru/uplcv?utm_term=killer+instinct+android+apk PDF link annotation
    • http://www.azurwelcomeservices.com/userfiles/file/xeselowitexojabegizuwivo.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/84106201390.pdfIn PDF document text
    • http://mutitar.com/user_img/files/dizipiforede.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/4889218398.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/dotubexoguri.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/givifu.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/63020364492.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/bamixiwipuwegusasijezis.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/damupu.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210919185429261497.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/48285167060.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/3220167806.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/vivixov.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/kazuxajolivubuvi.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/kagitukodumigo.pdfIn PDF document text
    • http://nprofit.hk/userfiles/bibozovotigofuvuw.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/91242992220.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20219203108624.pdfIn PDF document text
    • https://medtek.vn/storage/file/mezot.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/tefuwexajuvipigugo.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/15849421815.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/tupanopabujajazewigabe.pdfIn PDF document text
    • http://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/74019549185.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_off0000b165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97C 10592 bytes
SHA-256: 5ddeb18ace1f152123aafba5908bf1e7deef2b5b6157a7f6168dbcf7d7482c52
font_02_sfnt_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 16804 bytes
SHA-256: 6e5ded04d1b7b41df6b4e2c385c112bbc4da58564b727ef82bf60ce0c9b70071

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