Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1447ddca5ff47e5…

MALICIOUS

PDF

68.3 KB Created: 2021-09-09 09:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e133345ecd34c26d02963cdfda39f9a3 SHA-1: 6222f7d1c0f8eba2462f4fb8b3e460cdd3bb704f SHA-256: c1447ddca5ff47e5b4ed61afdc2629928bd3c109b5977c8276586df49276e027
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The embedded links, including one pointing to 'mfo-fond.ru', suggest an attempt to redirect users to potentially harmful content. The document body appears to be malformed or obfuscated, preventing a clear understanding of its direct textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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 http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/tijekojibilodexi.pdf In PDF document text
    • http://sprinter-lab.ru/content/File/97409030944.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/64200193427.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/77805306754.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/vogavutofuz.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/busuxowibalazejadozavin.pdfIn PDF document text
    • https://andhimazhai.com/images/files/86475422628.pdfIn PDF document text
    • http://klenderbio.com/upload/files/dagepixab.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/14694464222.pdfIn PDF document text
    • http://potya.com/kididipomezupusivem.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/xakenato.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/43569869183.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca97eaefc---47737335921.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/4729497066.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/17436498699.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/borizovitusubedigekema.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109060901264385.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/bixefufub.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/buxezopak.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/bolawitison.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/batasawukobamorajumavus.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/31374444986.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/giwakava.pdfIn PDF document text
    • http://licausi.it/userfiles/files/3000923423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=lucky+patcher+for+android+downloadPDF 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_off0000af2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2D 10900 bytes
SHA-256: 165cf2c761e0d1e7a5623e7c2e440e6f41df070e4fa0d3ceef86c6564891879f
font_01_sfnt_off0000c871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC871 14112 bytes
SHA-256: ad940d938871a093da7c291f88b3a853bcb60b3fb60dafb2512aa43541bf7958
font_02_sfnt_off0000eba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1