Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6455ba9f06ffa5…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 22:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d2d8a0b5e2004628a1831dd776109e7 SHA-1: cd5f6aa485c849c9707638493656d4434317a3d6 SHA-256: 0f6455ba9f06ffa5c861eaded6a45f26e851791e75970d43ac9ab0c2d02e6763
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-based interface designed to trick users into clicking embedded URLs, such as the one pointing to 'synerhu.ru'. The document's structure and the presence of numerous external links on disposable hosting suggest it's part of a link farm used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 69 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://synerhu.ru/uplcv?utm_term=wonder+woman+1984+streaming+french PDF link annotation
    • http://tractortools.cz/ckfinder/userfiles/files/5006666530.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/48035506937.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/37887948189.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/12371386834.pdfIn PDF document text
    • http://entrackintl.com/uploads/7749382634.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/fizuxubekijoxomixigon.pdfIn PDF document text
    • http://www.sczct.com/up_files/file/23665963143.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/17602903314.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/legagunaxoketar.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/7271610803.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464400256fa---durot.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/jagasiguvu.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/kalarabafozajawaj.pdfIn PDF document text
    • http://actinq.nl/upload/file/volonezus.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210925081830.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/1sndg50iq7c5vpvr15g8ebseno/22746026131.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/45240661913.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/25360114839.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/54030832734.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109111355035958.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/38134023127.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/39407043177.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/madipore.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/14408061035.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_off0000b163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB163 14264 bytes
SHA-256: 7344d39bae295b24391b4d297cbc73e70cb96fef696a89db8ec94aadd69efe69
font_01_sfnt_off0000d518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD518 11464 bytes
SHA-256: ac77eef1ebdcfd3a80b2d4080eaaf2523ffb39ba2fce59db9b3e335e8fce08a8
font_02_sfnt_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1