Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7a3a19c36a26e0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 06:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a3c3f106ef3ebe6af63ebefdbc82ccb8 SHA-1: 64dd140ab60f9ae5f1fbed405c0f1756367e4247 SHA-256: 1a7a3a19c36a26e0e8bef624654155ea51bfb808b452fc4320f38a0758905585
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 a large number of embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm intended for SEO manipulation or traffic redirection, characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://inwebjor.ru/uplcv?utm_term=cara+menghapus+file+di+trash+android PDF link annotation
    • https://imagebrandstudio.com/userfiles/file/42622799286.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/kolodilosovepenibezujasud.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/suxabukafura.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/49910920.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/viveluluwumepodekaluvera.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/jirinup.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/mapuvuxejodaxolubuzuxape.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/sedavabi.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/wezilajafodekujugak.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/76375532497.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/xuxam.pdfIn PDF document text
    • http://keramann.ru/uploads/files/12496990152.pdfIn PDF document text
    • https://2acontractor.it/images/file/zusetagazipekuvego.pdfIn PDF document text
    • http://digifast.cz/userfiles/nizod.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210909_AADCEEA218164F8F.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/79980385039.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/61350401827.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/napakuzepi.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/xivotisozokug.pdfIn PDF document text
    • https://fond.ru/userfiles/file/mawoxave.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/wusus.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/vunabibemorofopa.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/fiwas.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/55953518771.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/webelutufagewox.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/51713901482.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_off0000d857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD857 11076 bytes
SHA-256: 060fef57f709d61e313ac9db9c83cfd897b9e5b3495afe263aa8376752aeb54b
font_01_sfnt_off0000f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 16896 bytes
SHA-256: 7075dc7b4f66bdc6d87022bd16f020c347c8262cd47c4bb1b9d8b8cf6b28245b
font_02_sfnt_off00011d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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