Malicious PDF — malware analysis report

Static analysis result for SHA-256 3126fa50130716f3…

MALICIOUS

PDF

70.0 KB Created: 2021-10-01 18:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 74e35c7777cde4af72d9bee9657cf2df SHA-1: a95aea837cec3354a2d4d693a46cf07792e0a311 SHA-256: 3126fa50130716f3c3b945b0896cdaf5cb08eb02006461733fc79af1bf8f1710
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, and one heuristic specifically identifies it as a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic suggest the document is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=netzwerk+a1+glossar+pdf PDF link annotation
    • http://kovofilm.cz/userfiles/file/73778993876.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/94603183101.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210926064630204577u2zf0x.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/varazuviguwanil.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/kikadifetowisazaguz.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/rinojadamadomaxomovo.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/3320307021.pdfIn PDF document text
    • http://greenegiving.aboutgiving.net/sites/default/files/editor/file/vefazazigiwexegijokejitun.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210914_EE48C68E0BCF048B.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/mategaxufika.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/45456666444.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/nanikivegakomut.pdfIn PDF document text
    • https://foulardfotografando.it/file/mexeku.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/73954944868.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/fagolumeritumadonofuwu.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/44277433843.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/rojeselatagadibodap.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/e7443d8387ab47c3404edd214f7feb0d/lixogureladuridovomus.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/89786187239.pdfIn PDF document text
    • https://tch.lu/files/files/gadixewanuvudomar.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/5018467553.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/54847019315.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/11625121307.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/95009802509.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_off0000b18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99C 15656 bytes
SHA-256: dd02325245813967afda83e127f47e9def443e35bf441658cef687d502a5bb3c
font_02_sfnt_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 10744 bytes
SHA-256: 8ac48a7c13bfaa6b4353ea0f15e8bd46a3cee63088817e5b3c3e08ab37220323