Malicious PDF — malware analysis report

Static analysis result for SHA-256 258f3d32390ccb83…

MALICIOUS

PDF

75.3 KB Created: 2021-04-01 01:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb02ee4c38b729432c70ab16b4204f33 SHA-1: 3b2c0b632751606e6ee6621404adf87c05fb010a SHA-256: 258f3d32390ccb83640c3746753badf5cb0ee50d2255f8633f5ed9a6a79e877d
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm designed to obscure malicious activity. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/aws?utm_term=the+hobbit+3+hindi+movie+download+720p
    • https://tesujirigagorin.weebly.com/uploads/1/3/4/8/134869290/0a8545d15c48b.pdf
    • https://kimakinogi.weebly.com/uploads/1/3/0/7/130775446/d35c92.pdf
    • http://community-day.ru/pawutixt21d.pdf
    • http://bandalet.club/vscode_64_bit_freeh85qn.pdf
    • https://cdn.sqhk.co/zogameva/uZhjiik/play_football_cardiff.pdf
    • http://esclub.info/nuzesaligowiwuxukyb094.pdf
    • http://drenajkrasnodar.ru/how_to_make_a_secret_order_on_amazoni80n3.pdf
    • https://cdn.sqhk.co/fanabezom/Jghhcgd/babujadilumopota.pdf
    • https://zezawimikosalef.weebly.com/uploads/1/3/5/3/135329884/45a3f54ebbcaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sutawowirosuvuv/coleman_inflatable_hot_tub_pump_parts.pdf
    • https://s3.amazonaws.com/netinuwa/ban_vs_afg_match_weather_report.pdf
    • https://s3.amazonaws.com/nerugiraxura/fulijoxesanaj.pdf
    • https://uploads.strikinglycdn.com/files/6f793b10-0b2f-4186-a779-ab63a6120e83/17398389180.pdf
    • https://s3.amazonaws.com/mukut/indian_air_force_formed_in.pdf
    • https://s3.amazonaws.com/dorulusof/gufezidanomezod.pdf
    • https://s3.amazonaws.com/bagokiko/all_my_friends_say_it_over_mate_lyrics_cimorelli.pdf
    • https://s3.amazonaws.com/jolunenafobuw/it_stephen_king_cast_2019.pdf
    • https://uploads.strikinglycdn.com/files/4c26fcb9-2c21-40c0-8c78-b9e7015c9466/41028303619.pdf
    • https://uploads.strikinglycdn.com/files/16d9fd8a-98aa-486f-9038-ed72bb2f6726/fovamivopevagovudekunok.pdf
    • https://s3.amazonaws.com/gofilafixu/bellyache_billie_eilish_piano_sheet_music.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_off0000e7b7.bin
9837ed3c3cb347596d4d75bf7538625b9ea1c5d042ebdfa38f2d87e9e87e0eb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 5684 bytes
font_01_sfnt_off0000fafb.bin
8b59ab6d167bc90883c5657fdac5605bdbb1db8804709b9847f171b55b9281ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 10816 bytes

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