Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b8225fdd03b518…

MALICIOUS

PDF

75.5 KB Created: 2021-03-10 05:56:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3f473be5969af8e2c7079e0b5577f39c SHA-1: 52e5edfe4e86772191a21100e0ce650427ab01fa SHA-256: f5b8225fdd03b518321a0aa4ec9d30e354b04e86bc2287c21432f4136d861769
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/123?utm_term=miracles+by+walt+whitman+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/migukosodaza/CJhfICh/usborne_colorful_world_construction_site.pdfIn PDF document text
    • https://cdn.sqhk.co/jadizefon/7Thahey/super_santa_kicker_24.pdfIn PDF document text
    • http://xiriwijulul.22web.org/esv_study_bible_hardcover.pdfIn PDF document text
    • https://cdn.sqhk.co/zosurinipin/WQgjy47/red_sun_rising_uninvited_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/cGjfigX/stickman_war_kungfu_battle_zone.pdfIn PDF document text
    • https://cdn.sqhk.co/bikugipozamu/gfJQnOG/vr_360_horror_movies_download.pdfIn PDF document text
    • http://zhk-samolet-krasnodar.info/88434274388mb90f.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/2220638746913ng0.pdfIn PDF document text
    • http://momentikshop.space/neverwinter_nights_game_guidekhyct.pdfIn PDF document text
    • http://kowezuzapine.66ghz.com/berita_thandolwethu_mp4.pdfIn PDF document text
    • https://simepatu.weebly.com/uploads/1/3/4/2/134267103/febimilobodipo_fekivunapuzuw_lulaposavam_zufopame.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/jJfhjxk/39024566115.pdfIn PDF document text
    • http://bilapak.66ghz.com/ruremadutarak.pdfIn PDF document text
    • https://xevulesej.weebly.com/uploads/1/3/0/8/130874496/790315.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/ymfieif/vejomoz.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/9hawGBP/krita_review_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/wituruxa/6nAAieT/sokumaduje.pdfIn PDF document text
    • https://cdn.sqhk.co/jibetovo/aiivhjB/marvel_pinball_nintendo_switch.pdfIn PDF document text
    • http://voztrans.ru/what_channel_is_classic_country_music_on_directvyd0hk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ab6726-94e2-49cb-b2d0-8381254ed459/90421206726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f494d5-c6fd-49da-9055-26b5318a4c87/the_lying_game_season_2_episode_5_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed5d67b-5c2f-4b10-a685-a1f92ee1b08e/79896581291.pdfIn PDF document text
    • http://lafugigolemetuk.rf.gd/battle_royale_games_non.pdfIn PDF document text
    • http://wekujugom.epizy.com/42333747993.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 5644 bytes
SHA-256: 2303ba67b6a4ed8b3daf98cbb213571ef03e7f4422c517086bb5f05a5f9e4404
font_01_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 10692 bytes
SHA-256: 2278a1f0a6d5b2f9447c2f5eb3d8f195df843f3c8436369035f627c68d3a1169