Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e11c34448422a89…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 20:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 188c3d0ab63a5f0a6d6f5f23c4ce05b9 SHA-1: 158d6c1c91aec6f5a6a217f1eaaa297d9ae36fc3 SHA-256: 9e11c34448422a89d9562393ed3bc689921d335b3beb9e6922cb0c7e1bfc4288
146 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 numerous external URIs, many of which point to disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The document body is heavily obfuscated and appears to be a screenshot, a common tactic to trick users into clicking a malicious link disguised as a button.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 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.
  • 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://smidgel.ru/uplcv?utm_term=probability+of+compound+events+worksheet PDF link annotation
    • http://alexlunacoach.com/img/editor/file/63284506533.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/50696513135.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/95818776891.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305ebcb299e---xamivafu.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142da547ea85---vowamosumij.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/57732107942.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/77623183877.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210912221810.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/zudewa.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/virokera.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/29833646317.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/pojekepabugu.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/1071747990.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/taworuwonawuwigiga.pdfIn PDF document text
    • http://labonscafe.com/userfiles/96327485033.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57792196137.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/57646652025.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/67291268216.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/lejemogev.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/kawamukuritazodaligejuva.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/favegatimeveraj.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/70735126919.pdfIn PDF document text
    • http://stisk.com/file/mebes.pdfIn PDF document text
    • https://bczenekar.hu/files/file/34030958831.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_off0000b2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D5 14216 bytes
SHA-256: 511d0c2b3a61d26262c17e4eafa36d3017ead339270e91c7d180ede7da49661e
font_01_sfnt_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 11484 bytes
SHA-256: 255da78d4bfde4c164ddf1dc6fe56b2b00c316acf611dbbfe92f6a5421b808b0
font_02_sfnt_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1