Malicious PDF — malware analysis report

Static analysis result for SHA-256 497dda841b5a85e8…

MALICIOUS

PDF

86.2 KB Created: 2021-10-04 22:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1681185a60bbd1c15166aec57aa61bf2 SHA-1: 6891f40b57ceeb1eb9cc6fec68df6d85f4da4ec2 SHA-256: 497dda841b5a85e8676002c33eb48747c0b81de14742cf968954673918ebf9da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable domains and configured as a link farm, suggests a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8564

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://fructusartis.com/i/File/83443129555.pdf In PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/sizowe.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/71774049298.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/pifotobewufulonujuvez.pdfIn PDF document text
    • https://cooperspick.com/files/zulukugupu.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/64716623931.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/taxisotimufibun.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/73559690457.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ad5716032149d350571d34790805bfa/72853311266.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/17724861210.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/67783532597.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/xiriraw.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/172038276735.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/15426034234.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/jizidewejalat.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/97853378780.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/jizuzivagafak.pdfIn PDF document text
    • http://askaudit.ru/price/mibetekowitinuxuvumow.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/sufanazofozalobefejasawof.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/dizidugewopugajoliji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a64d5982b---zexujoxeb.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/kifegovokixazowi.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/dusibegosadawakigesi.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/95541866103.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109131109078665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=baked+oysters+in+shellPDF link annotation
    • 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_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 10604 bytes
SHA-256: 258183893bde552dcb83e98442fe89af2dbeb3e755de39274902dc003b9e62de
font_01_sfnt_off000107f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12002 20620 bytes
SHA-256: 438699be98c175aa0cb9f68cf102d916e679c39dde9f1822bde2f9dc41af084e

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