Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6533c693f2a2b25…

MALICIOUS

PDF

68.4 KB Created: 2021-10-04 10:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5abe8caf32e4ee58aebcfdb0dadaa4e3 SHA-1: e0be1d7a0bfe2005b07befa175e0188e4360fceb SHA-256: b6533c693f2a2b253fad81025608965eb7ce12ec1056cc75095c014de3d8222f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to hide a clickable malicious link. Multiple heuristics, including ClamAV and an ML classifier, confirm its malicious nature. The document contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm, increasing the likelihood of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/13c2550a2776ff1e000f3b017d7af048/lodofimaki.pdf In PDF document text
    • http://dalaichau.com/files/46629319347.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210916181513.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/gemixusikowinagav.pdfIn PDF document text
    • http://haqwali.biz/files/file/17807245628.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/23417067021.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/dirujalimikapepixinuluf.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/21512141636.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/wuvefol.pdfIn PDF document text
    • http://yibetter.com/data/files/79586765866.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/zozejiwekaperabi.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/jagevar.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/61409972118.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20925339064.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/wuwogejamiruxovitup.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/1550193409.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/59000388248.pdfIn PDF document text
    • http://nincity.de/inline/file/64323813315.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/15399417754.pdfIn PDF document text
    • http://pronobile.de/catalog/file/44399032926.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/ditulizif.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/16433478307.pdfIn PDF document text
    • http://lapalettedesarts.fr/gestion/file/84645835336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=scripture+about+windPDF 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_off0000b16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16F 10696 bytes
SHA-256: cb4e85d0e7b50e337c4b9b36c5eb898ca7b32e7bca92f54bd8a3b3a6ee792f52
font_01_sfnt_off0000c9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F0 13756 bytes
SHA-256: e0adf85d519509515613360e2ae7358c10dffbb526c207c4b1e849807dd2e430
font_02_sfnt_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1