Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd495c3e6f3940ef…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 03:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7dac43304284118da833458c442dc27b SHA-1: 85f6b7274eec6597fefeb02c6355bff70b51bc81 SHA-256: dd495c3e6f3940ef6296131edb5a098c281796897c64b19517df9598326bad00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs point to a link farm strategy, likely designed to obscure the true destination or host phishing content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://triyoga-tv.ru/userfiles/file/56577352033.pdf In PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/lexudaxivu.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/nujonizogige.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109060159432763.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/84286195155.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/1449266538.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/4498266705.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/24580408212.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/97642866628.pdfIn PDF document text
    • http://yoron.net/up/files/56854796848.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/kegorer.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/xuzisamumagupoken.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/91607152973.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/ganilogifinakan.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/9699229203.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4211e5453---55434940449.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/temij.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/3520395932.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nilonarekafumetexe.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/wipifegabatelapogenubeji.pdfIn PDF document text
    • http://parentini.it/userfiles/files/makazuzerexixexifemo.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/jojak.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16150e5121d97c---risizuxavojuzumafefar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=german+truck+simulator+apk+androidPDF 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_off0000aff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF4 16568 bytes
SHA-256: fb622f7f3d263ec9296118aae8b7115da80b9f785b4364075aa52981de6a52a0
font_01_sfnt_off0000da30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 10908 bytes
SHA-256: 8d678a19bc09bebe2f2240147b46191d974150bf9869932d27c829133d5ab469