Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fbdc3feabbeb589…

MALICIOUS

PDF

68.1 KB Created: 2021-09-27 01:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7677e903ba372e69d04b5dc71b7d665 SHA-1: 5366b319bcec4a65aeafe9f8b0f7d1811d850aea SHA-256: 7fbdc3feabbeb589879dbcc98e687c0e19b743b006936ea181755fe18f5cc5ea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and multiple external URIs, suggesting an attempt to redirect the user to a malicious site. The heuristic 'PDF_IMAGE_LURE' indicates the document is designed to look like a screenshot, further supporting the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pixomot.ru/uplcv?utm_term=how+to+do+a+screenshot+with+android+11
    • http://bckvalumni.org/userfiles/file/73462782672.pdf
    • https://ruta.hu/ckfinder/userfiles/files/32170803397.pdf
    • https://krzczonowice.pl/gfx/file/96196628759.pdf
    • http://albertopizzetti.it/userfiles/files/wesizavagomuz.pdf
    • http://vantaidongsaigon.com/uploads/files/60444762893.pdf
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/73717258745.pdf
    • http://www.dawnrotaryclub.tw/UserFiles/files/kazujapabiv.pdf
    • http://semihkerpiccilervesupersound.com/upload/file/3909401982.pdf
    • http://vimar.ua/userfiles/files/75848117231.pdf
    • http://scard.vn/app/webroot/uploads/files/47524530042.pdf
    • http://grafittipng.com/userfiles/files/siluzavupowebanififi.pdf
    • https://cleanenergy.mn/uploads/files/25841237109.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136160a14d27---11923980564.pdf
    • http://chi-kara.net/userfiles/file/togevofam.pdf
    • http://polletnv.be/uploads/files/pukebuligida.pdf
    • http://projecthouse.bg/uploads/CKfinder/files/25578072140.pdf
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/76615958075.pdf
    • http://dongamold.com/fckeditor/upload_files/file/66939283653.pdf
    • https://codefon.hu/js/ckfinder/userfiles/files/46211823759.pdf
    • http://tivati.com/uploads/userfiles/file/12835112109.pdf
    • https://nilsahost.com/calisma2/files/uploads/59084821276.pdf
    • http://narzedziascierne.eu/Upload/file/godid.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aed4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAED4 16792 bytes
font_01_sfnt_off0000c6e6.bin
253eab3c532dcebf1c804ffce2c83375595265e7eedfbc45a174161626907545		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E6 14220 bytes
font_02_sfnt_off0000ea47.bin
1d8cad57cf30177b8a20207a873bb80a13f38206e1578bb6d3a1b8da531cb3c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 10552 bytes

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