Malicious PDF — malware analysis report

Static analysis result for SHA-256 4419d564ba470ff4…

MALICIOUS

PDF

78.0 KB Created: 2021-03-02 02:48:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 739540f0f3f397f90b9e79fc3ffc02e3 SHA-1: 9d84f640178ec51658971d9a9b46b3df8b072a72 SHA-256: 4419d564ba470ff487b3f114d456ee3f8b94bb355e31d5d9b1aeadf076f99637
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be related to search terms, reinforcing the lure aspect.

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
  • 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://nipisod.ru/strik?utm_term=dyson+v6+dc58+battery+replacement PDF link annotation
    • https://cdn.sqhk.co/zopezepazedo/hja8iyz/mine_runner_game.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/ggdigja/werewolf_the_apocalypse_earthblood.pdfIn PDF document text
    • http://registrat.space/how_to_play_cyberpunk_2077_early_on_pc_redditfuszb.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/igjhhhm/fire_ant_queen_lifespan.pdfIn PDF document text
    • http://reduslim-italy.site/guitar_music_sheets_popular_songs_freetp8ev.pdfIn PDF document text
    • http://gudokav.sportsontheweb.net/54705264112.pdfIn PDF document text
    • https://cdn.sqhk.co/juselivo/jeidXhj/gebisizaxaxefotuzul.pdfIn PDF document text
    • https://cdn.sqhk.co/zifixanuk/hiehfhb/44417117416.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/hbp9hib/oxygen_concentrator_dealers_near_me.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/how_to_put_on_a_cvs_blood_pressure_cuff.pdfIn PDF document text
    • http://fb-pageunderreview.com/bass_guitar_tab_sheet_musicrzipf.pdfIn PDF document text
    • http://taygerr.com/8662811852dd7oq.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/jinabom/zaleverogaw.pdfIn PDF document text
    • http://nununad.myartsonline.com/xufabedinekukada.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/32623463168.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/lulivo.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/fonebotezuboledifabuwuwo.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_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 5732 bytes
SHA-256: cfc27df424aaebbbab6f72e7acb2eeb92c58208bd25be0b503b7d53224b8efc6
font_01_sfnt_off0000f950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 10408 bytes
SHA-256: 7955ac7a3caeebdb45551eeb212819c4fb304409c265773cf7dcf3ae04b028eb
font_02_sfnt_off00011cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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