Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d318cb77470b13a…

MALICIOUS

PDF

78.2 KB Created: 2021-01-28 10:46:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a2b787aefebb2c724681e69572988944 SHA-1: 298fa7ac5f222c60ba5e43f88ab1ef87055c34c2 SHA-256: 9d318cb77470b13aeda8c250d4fa1f88f67292675cac9d0e18d0285f8f767bc9
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to host disposable content, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=cor+thermostat+user+manual In PDF document text
    • http://idealicacolumbia.site/shelter_island_hotels_san_diego_caafpis.pdfIn PDF document text
    • http://soldonlakewood.com/legendary_stuntman_run_modut8xa.pdfIn PDF document text
    • http://lyudi23.ru/jekiwemofirogabesirttdn.pdfIn PDF document text
    • http://geekcods.com/53736686642xpfl1.pdfIn PDF document text
    • http://bestrongbyg.com/anime_glitch_wallpaper_4k0gnob.pdfIn PDF document text
    • https://kekisuganuzab.weebly.com/uploads/1/3/4/7/134721312/fasad.pdfIn PDF document text
    • http://copyrightshelpscenters.com/warlings_armageddon_hack_apk_mediaf_rell34b.pdfIn PDF document text
    • http://gogadozuxigode.iblogger.org/fogedabafitot.pdfIn PDF document text
    • http://price-list.moscow/storm_of_steelhv317.pdfIn PDF document text
    • http://lakulikelanu.iblogger.org/41714537971.pdfIn PDF document text
    • http://matrixbicycles.com/refuse_the_god_king_covenantr4zgy.pdfIn PDF document text
    • http://meetchat.space/alienware_area-_51_alxwg0yk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zazelujeju/insulation_sheets_for_garage_doors.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/lagu_hanya_rindu_versi_lirik_korea.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 4784 bytes
SHA-256: a80f2a799db35cdfeabfc450c033bdc53053f7f7d5c36ac7f67f325677c29bd9
font_01_sfnt_off0000f483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 11952 bytes
SHA-256: f0a9cf0d9f4c45154e2762c282590b7dda7f8f2faa65f766d593068618ce1e40
font_02_sfnt_off00011c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333