Malicious PDF — malware analysis report

Static analysis result for SHA-256 acde052db566a4ee…

MALICIOUS

PDF

68.9 KB Created: 2021-09-16 09:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 37ac7d68d662de1b31f3cf0f6eb91529 SHA-1: ec50416550b3ff0c45e8f3667ef59f9864460067 SHA-256: acde052db566a4ee2e3d1fc934fa49db2a6f2d3ab96c1d212c29e6cf59375287
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains minimal text and relies on an image to entice users to click embedded links, such as the one pointing to 'huntic.ru'. The document's structure and numerous external links suggest it is part of a campaign to redirect users to potentially malicious websites.

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://huntic.ru/uplcv?utm_term=among+us+game+free+play PDF link annotation
    • https://hotel-la-licorne.fr/userfiles/file/66834390518.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/90986165103.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/fomegadup.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/bepibepukexedilomarebud.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/jadawojefatubixobedutudik.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/50349346522.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/200779311761332b7e067f0.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/21001854297.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/26812556754.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/92999416336.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-3/20210903032837859175.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/63196470172.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/pavakixabul.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/74569557098.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/96ba7da1c04272230e62fb126933bb7c/75442982984.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/furusiziwalebivajufe.pdfIn PDF document text
    • http://keramann.ru/uploads/files/81192286412.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/kixopozazugiwig.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/28215520245.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/54336213403.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/59974337824.pdfIn PDF document text
    • https://areicon.com/images/file/31631043542.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/50738473045.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_off0000b16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16F 10708 bytes
SHA-256: 0529deee8f09922cddb9167e5271073fd56f54951f3da5950416baa3443bb2a2
font_01_sfnt_off0000ca14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 13948 bytes
SHA-256: ecd63ba2d5b2b61d0f09351b764707050d62bf7dc46685b32bc70ec8efe36bdc