Malicious PDF — malware analysis report

Static analysis result for SHA-256 039dd6fe5b7fc28d…

MALICIOUS

PDF

67.5 KB Created: 2021-09-27 17:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a0018813b5bb1979225591c02f7d2a8e SHA-1: a62ff318231446c0e6f1dabe13f98c12161dddd2 SHA-256: 039dd6fe5b7fc28d3474f8f60fbded3d04186235b52f078113b44be9924c0095
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristic 'PDF_IMAGE_LURE' indicates it's an image-only document with a clickable action, designed to deceive users. The presence of numerous external URIs, including one pointing to 'crewmak.ru', suggests it's part of a link farm aimed at distributing malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 67 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://crewmak.ru/uplcv?utm_term=organic+keyword+search+tool PDF link annotation
    • http://muabannhagiare.net/images/uploads/files/11656655701.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/topev.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/30571134758.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/fepakawokozajakisipub.pdfIn PDF document text
    • http://rooptex.com/uploads/59516497984.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/vofusezigetizepolirej.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/74177050338.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b4f0a693cf0e4834a15c289d244183fd/getumugegu.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/96056817514.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/84350488149.pdfIn PDF document text
    • https://tomas-music.com/contents/files/90425454934.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/12513205447.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/nujejexavesuzidemibedi.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/78509089049.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/36549550795.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/95423737188.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/32397009441.pdfIn PDF document text
    • https://maria-galland.ru/files/file/64565171530.pdfIn PDF document text
    • https://fond.ru/userfiles/file/60360832284.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/likanomazaluvi.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67550728863.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_off0000aac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DF 10964 bytes
SHA-256: 77b3669d610bc8e822b7632e09a02f18a03a34154f78e0fb45a6b160d1b18393
font_02_sfnt_off0000dc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2A 14152 bytes
SHA-256: 9e20b1ac01484abd741f82b44c28eaaccc0aec56f18078853958a8f57e709d51

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