Malicious PDF — malware analysis report

Static analysis result for SHA-256 517f72d118c87cab…

MALICIOUS

PDF

87.1 KB Created: 2021-09-12 19:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f2dfaacb75a7c6e293a530fb9e93e1d3 SHA-1: 1a0adb71a409239890580b1f463c8420965cfabe SHA-256: 517f72d118c87cabdb3e59c36ac78a39fb4f4733607f52cefc9a625c899281f3
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 pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high volume of links on potentially untrusted hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://pk.mo/userfiles/file/soziluxexilatutusifubovot.pdf In PDF document text
    • http://naturestuff.nl/siteimages/file/zujidiro.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/dipidevifexedowewita.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/35488479970.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/jebeveb.pdfIn PDF document text
    • https://jin-ji.com/upload/files/74042882306.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/namawutalovemamaj.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/nuxanarejanebudanoxeke.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/22708929595.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/wezegumukiluri.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/fanud.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/majavuwobivazufikosedimo.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/sijasexeperirarid.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/48939053180.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/37835034146.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/ropivujuxujowodak.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631297988.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/66885796093.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380c488d309---kiwakofanoku.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/vopizelap.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/16152872830.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/34749306717.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/17100141698.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/faxemisojesakotan.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac491fdb6---zowovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+move+contacts+from+sim+to+phonePDF link annotation
    • 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_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 17252 bytes
SHA-256: d149dc7e6815b728cb101ab1911090cc9ca96666bc2ee0c034b43f3af5bedaaa
font_01_sfnt_off00011d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D50 10888 bytes
SHA-256: 86028ad6f83a45b14a1ea83f697d8a1770f74dcd39e2197530fa8738e0e0fd46
font_02_sfnt_off00013655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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