Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4c308132faf8f1…

MALICIOUS

PDF

78.8 KB Created: 2021-06-09 13:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a51a2b0f5e4d024708f93170632f75c9 SHA-1: 3ed956da41ec4f28607945bc80cfa3bc867113f2 SHA-256: 9c4c308132faf8f1086ab67708567d8bedc381fb41b86a8a8b99d930b7a27f19
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to 'Fnaf ar download latest version', suggesting a lure for users seeking game downloads. The presence of numerous external URIs, many pointing to disposable hosting and link farms, indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://krisoc.ru/pbw?utm_term=fnaf+ar+download+latest+version PDF link annotation
    • https://gopoxigubujazu.weebly.com/uploads/1/3/0/9/130969754/nudozazedumobazisajo.pdfIn PDF document text
    • https://dotudamel.weebly.com/uploads/1/3/5/3/135326114/6489534.pdfIn PDF document text
    • https://wadezadoli.weebly.com/uploads/1/3/0/9/130970015/9b581e8b5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369908/normal_60026609a8d73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420587/normal_605d5aace46d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_60547761abb41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483362/normal_600f5e0d1dc57.pdfIn PDF document text
    • https://xagiwejobumumok.weebly.com/uploads/1/3/6/0/136051235/josema-jokesasomare.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457604/normal_5fc594458af5f.pdfIn PDF document text
    • https://tafanavudijis.weebly.com/uploads/1/3/5/2/135299899/woxelepamejevopa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452588/normal_602a9a6425d74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feselikebapu.pbworks.com/f/5035529585.pdfIn PDF document text
    • http://betifufato.pbworks.com/f/uc_mini_apk_download_play_store.pdfIn PDF document text
    • http://wotasaful.pbworks.com/f/zipufezelonereguligusi.pdfIn PDF document text
    • http://gatunam.pbworks.com/w/file/fetch/144559038/interstellar_hindi_dubbed_filmyzilla.pdfIn PDF document text
    • http://fisukafetif.pbworks.com/w/file/fetch/144425178/how_to_adjust_resolution_on_lg_monitor.pdfIn PDF document text
    • http://zudilazo.pbworks.com/w/file/fetch/144654531/xikerab.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144485625/60073799125.pdfIn PDF document text
    • http://gutopevif.pbworks.com/f/71776382372.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/77806212844.pdfIn PDF document text
    • http://pilujibos.pbworks.com/f/57650397564.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/f/mine_survival_mod_free_craft.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/1776_musical_libretto.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_off0000df8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8D 5008 bytes
SHA-256: 9c8f68c1f1c8dc051b32bd8d0fe95cefef0c2155d5f9b6b7ad49e989dec28720
font_01_sfnt_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 10944 bytes
SHA-256: e0901291f256a5f955ac40849d68c90d6c1da70ec16fe300298a70159b398527
font_02_sfnt_off00011640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11640 16120 bytes
SHA-256: fcb9eb6dda9bd85871dea2af886fe36482f59afbed4642006e79d2ab71ff4177