Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0857fe5003f971…

MALICIOUS

PDF

88.9 KB Created: 2021-03-29 06:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6d1e16a8a4c557bdaedc0100343a7d9f SHA-1: b70d38fd684b21ea58045d4ba6bc9805a1a4d634 SHA-256: 8c0857fe5003f971c98adf59740c1f812d4cdc72571b55b1065d14927bfbf257
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, with a prominent one pointing to 'resalured.ru' and a keyword suggesting a download lure for 'gta san andreas apk'. Heuristics indicate the PDF is part of a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious phishing content. The presence of external links and the nature of the embedded text suggest an attempt to redirect users to download potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/wix?keyword=gta+san+andreas+apk+for+android+4.1.2 PDF link annotation
    • https://cdn.sqhk.co/ravuviwidi/cUPiehe/btd4_track_editor_free.pdfIn PDF document text
    • http://ludirobus.getenjoyment.net/mifizoviridam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379744/normal_5fcfaa8b760f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403421/normal_600ef79d2734e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459628/normal_6007c4c4732b8.pdfIn PDF document text
    • https://cdn.sqhk.co/puwupasakej/SYmgfje/eon_player_pro_apk_5._0._6_r30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465394/normal_601cdd1fb6dde.pdfIn PDF document text
    • https://cdn.sqhk.co/mumepefofise/BgfsjdG/sivusosaxudunoviziror.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_5fe73acd5e4d1.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/20368071533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388827/normal_5fea1cc5e6a0e.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/mta_subway_map_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413458/normal_604733a5b0b78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_5fd28538d3866.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lumosaneja.onlinewebshop.net/cardiology_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/stihl_hsa_56_cordless_hedge_trimmer_reviews.pdfIn PDF document text
    • http://bugazepoja.onlinewebshop.net/instant_notes_ecology_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/covering_letter_templates_for_jobs.pdfIn PDF document text
    • http://ratobewiwigu.atwebpages.com/lanebowirenuxadoril.pdfIn PDF document text
    • http://tudugir.atwebpages.com/tikomimavutamovofukewe.pdfIn PDF document text
    • http://xogaduzop.atwebpages.com/23005485948.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://scripts.sil.org/OFLIn 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_off00010733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10733 5400 bytes
SHA-256: 10f9bd34ab377716daab01f19aacc604cb90fb698f09294a2a86469fd20a793c
font_01_sfnt_off000119bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BB 11032 bytes
SHA-256: b3993c828399e24785c31c675a152f1ac4d5054e877abf770bf9e2554e78ef77
font_02_sfnt_off00013fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA2 16660 bytes
SHA-256: 451a97a76e1cd188b335db18aa59b090969584b10ed985ec5dcca0b5cdb1d7ae