Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ad2cc35194fb6a…

MALICIOUS

PDF

68.4 KB Created: 2021-10-07 13:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 29fc69773317dbfca40e4eeb15cc9844 SHA-1: 1342ce5504a44f03c6de2a6ebafc8f1a87d18691 SHA-256: 89ad2cc35194fb6a750881a2ccb454227bb61267c290788a809a07ec16857ca7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure with an image-only design and a clickable action. The heuristic 'PDF_IMAGE_LURE' indicates it's designed to trick users into clicking an external URL, which is supported by the numerous embedded URLs pointing to potentially malicious domains. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 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.
  • 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://philabc.ru/uplcv?utm_term=repeated+subtraction+division+word+problems PDF link annotation
    • http://derp74.fooden.com/UserFiles/files/loselufutidetuximolebol.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/13817757379.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210926_F73232BA7D08F99E.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109210005383584.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/xulasexefigugosiva.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/vozezufajenuzos.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/puxulukaxul.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/paxawurovazoke.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/62682907182.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/49197175020.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/burizuxaganesam.pdfIn PDF document text
    • http://jump360.co/upload/files/20210918034739.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/wijoferasibigu.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/jerif.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/40279735811.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/bakifilememu.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/xajiranujokulamudotufel.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/11610528033.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/wivuz.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/54629379262.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/16667778226.pdfIn PDF document text
    • https://dcimx.com/files/larewuxakaridal.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/22806632674.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_off0000ad7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58C 14180 bytes
SHA-256: 6f1527da10b69a70a4c026a1519c15331b593e21240f8003b5d26043672891e6
font_02_sfnt_off0000e8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 11112 bytes
SHA-256: 2d73231af22b9abbd405e92d57262b688b7c6f27329c58939e52089f6658d91f

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