Malicious PDF — malware analysis report

Static analysis result for SHA-256 879f02533dd380c4…

MALICIOUS

PDF

76.8 KB Created: 2021-10-07 07:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e69e6e8c05a73f711ec518eea4943502 SHA-1: e6c3927cf17c29933527e7fb62dd6a1ff0cec182 SHA-256: 879f02533dd380c4e24ee10c34510d5d7fcaf965b77dabca5f4476876562e4e8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with a high heuristic score for embedded JavaScript. The presence of numerous external URLs, many pointing to PDF files hosted on potentially disposable domains, suggests a phishing or credential harvesting attempt. The embedded JavaScript is likely responsible for initiating the malicious activity, possibly by redirecting the user to a malicious site or downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://przyklejki.pl/userfiles/nigapedigek.pdf In PDF document text
    • http://tetrafluoro.com/upload/files/60859868682.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/41567363300.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/vakozexixafa.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/dowoledefizugiko.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/losebuwifibirab.pdfIn PDF document text
    • https://www.colegiumaniucarei.ro/ckfinder/userfiles/files/jijizo.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/viturujajotobepod.pdfIn PDF document text
    • http://bienbao.org/uploads/files/20912792335.pdfIn PDF document text
    • http://maha.tcnme.com/chop/multimedia/userfiles/file/82926222182.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/viselazijinixobag.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/bexitebafedusum.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/jupafoz.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/16791963576.pdfIn PDF document text
    • http://lgassociates.in/uploads/rajavo.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/70991768068.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/mirum.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/75358175473.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/ledovivamusuneduj.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/munaxezijudo.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/fawabawisetuvaguvarekat.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/32586346555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+draw+mulanPDF 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_off0000c56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56A 10192 bytes
SHA-256: 725048bfd1fb428cb6f603cbe9b206679307838aa4938313a3635e4db3aa255d
font_01_sfnt_off0000dc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2F 19240 bytes
SHA-256: 8810daec7f6c1d9b6d113138646f6665df12f2d605d9f83d6d281342afd8700d
font_02_sfnt_off00010e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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