Malicious PDF — malware analysis report

Static analysis result for SHA-256 3304fec195b3aecb…

MALICIOUS

PDF

91.7 KB Created: 2021-03-24 14:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58e224d65674d8d8cca9145b8c11603f SHA-1: 3418b1f9c8af5ca10566ef31827fe8e57a630348 SHA-256: 3304fec195b3aecbcec117d3db3d871b3a4d0df67f95ddddfefae92d00034481
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to popular search queries, aiming to trick users into visiting malicious sites.

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://kuzutuzo.ru/strik?utm_term=what+is+the+next+diary+of+a+wimpy+kid+book+after+wrecking+ball
    • http://nogivubuleduwi.22web.org/ninipepezowarewivaf.pdf
    • http://taxurofetizi.22web.org/majedinepemazexiritug.pdf
    • https://wuwesojelure.weebly.com/uploads/1/3/5/9/135973580/wikixegikix-vafalapiwuvuwa.pdf
    • http://miludigava.22web.org/lakutawenazakuva.pdf
    • http://ralenexixozuk.iblogger.org/giorno_theme_violin_sheet_music.pdf
    • https://navemozozaju.weebly.com/uploads/1/3/1/1/131164567/gijusomo-felanoxule-jorizamow.pdf
    • http://wonamesavap.iblogger.org/46262446215.pdf
    • http://sikalaporaka.22web.org/bleacher_report_college_football_predictions_week_2.pdf
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/gelonasudaro.pdf
    • http://japadalifu.22web.org/dijadivixinujatiwa.pdf
    • http://worilura.22web.org/how_to_work_out_the_volume_of_cubes_and_cuboids.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dusalotiwuje.rf.gd/annabelle_creation_movie_free_in_tamil.pdf
    • http://fixuwebevu.epizy.com/vevugunomimalorozaw.pdf
    • http://luzigipo.epizy.com/192809460.pdf
    • http://jaxivaganidira.epizy.com/billings_ovulation_method_chart.pdf
    • http://sikegopivizegaw.epizy.com/97709518491.pdf
    • http://lopaxoreje.rf.gd/bible_concordance_kjv_online.pdf
    • https://uploads.strikinglycdn.com/files/a4269ddd-8a90-48f1-9206-3c5ce351a19d/zexelovasukefipon.pdf
    • https://uploads.strikinglycdn.com/files/13a90e84-7c48-44a8-a382-7af0f01a8ad6/ftk_imager_4.2.0_user_guide.pdf
    • http://lewiwosu.epizy.com/55106514729.pdf
    • http://didavemuromu.epizy.com/crontab_format_every_10_minutes.pdf
    • https://uploads.strikinglycdn.com/files/5c207663-d140-4393-ae0c-15c738bb1cc6/skyrim_finding_runes_name.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128a0.bin
3e3ee79e44c7fd64a56242e9b02a445023692b1cbddd59596672bad5b183c918		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128A0 6048 bytes
font_01_sfnt_off00013d2f.bin
be43fe7738fdf5ab2ca32fb6135de0b72a929ec9cd183163594fe7054478a69c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2F 10436 bytes

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