Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc611cdc4a3e6a7…

MALICIOUS

PDF

74.2 KB Created: 2021-09-12 01:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8d83d6bce5e6e28adeab8991a0584626 SHA-1: f59f60fdbd415cb2c0af63346edc44d1e3fd4076 SHA-256: 8cc611cdc4a3e6a775a2d15f5441bc3b59b4be9e471ff37468ba818cb522f75e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URIs suggest an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://coretry.ru/uplcv?utm_term=android+overlay+image+on+camera+view PDF link annotation
    • https://naveenent.com/administrator/imagetemp/file/91500632398.pdfIn PDF document text
    • http://mutitar.com/user_img/files/75869143309.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/14815978008.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/54704097921.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/63111987450.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/gumenif.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/64639882496.pdfIn PDF document text
    • http://guitarenko.fr/img/files/tatadefu.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/4071285558.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/98959419714.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/16844200546.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/10828188890.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/39086881768.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/sabulimetozaxavewibubo.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/21477413986.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/kerunepogebixegemodofa.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/25831500163.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/musokifusewokimururis.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/fofiratewukofodunezizel.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/65aeabcd215154e03ef439dc1fc77561/xedevawuveburavoj.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/22651780850.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/zafodijibil.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/65855649494.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/pulerozib.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/87e97ac0e2bbbb50df7cf0dea17067b7/ruwepipude.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_off0000bf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 10692 bytes
SHA-256: 31a9bcf5b0c02757371ba6cb5c045a8b3ae1fa977228e5de488170acc5b8fcac
font_02_sfnt_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 16972 bytes
SHA-256: ba7dee0189eec9dd66f9945f49480dd1740306240a67e44bea32864bb6574364