Malicious PDF — malware analysis report

Static analysis result for SHA-256 f508bb54709f9589…

MALICIOUS

PDF

80.1 KB Created: 2021-04-07 02:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f0831837474b7d92f086a7b3cc827c6f SHA-1: 950870a24ceb168851cd1172461079984d302a8f SHA-256: f508bb54709f95896d5d54ba42ba6a4586ff16c3fd717e1cc5899feef8435bad
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=maxwell+house+haggadah+pdf+download PDF link annotation
    • https://cdn.sqhk.co/zogobadakedu/idx5sUM/jexug.pdfIn PDF document text
    • https://mogeletonedilo.weebly.com/uploads/1/3/1/4/131482944/6f5965e6.pdfIn PDF document text
    • https://cdn.sqhk.co/liwifetil/UEIjbjc/63704505928.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/x3igylH/plasma_invaders_classic_arcade_space_games_like.pdfIn PDF document text
    • http://italonewsero.site/fenusodorugodixi0mdyd.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/ihicyid/xavuwusuzimerobibi.pdfIn PDF document text
    • https://susakatevasek.weebly.com/uploads/1/3/4/8/134871092/05ba4226267754.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/9261535.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/jxZZggy/evil_rising_district_78.pdfIn PDF document text
    • https://cdn.sqhk.co/fudimesa/cjgiigf/tepujugume.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/jj3ojct/auto_send_message_whatsapp_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/merisipugito/jeYCEha/love_breakup_video_songs.pdfIn PDF document text
    • http://servicesforsupport.com/advantages_and_disadvantages_of_addie_modele7x64.pdfIn PDF document text
    • https://robaralimojo.weebly.com/uploads/1/3/0/8/130814718/zaxop_gowipedanodumos.pdfIn PDF document text
    • https://cdn.sqhk.co/goseluna/M0Npchb/babadolixebarogadezisu.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/afabc58e-b90d-4e9c-bd9a-cb3b8aeb6c8b/girl_with_the_dragon_tattoo_torture_scene_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67dff4a7-3ad1-4235-b855-19cb3bd9c08f/what_jobs_can_you_get_with_a_computer_programming_degree.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2a843d-a6a0-4013-882f-b9ba6afe42e2/is_bob_evans_sausage_gravy_keto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7dedc42-0c31-4a20-bc97-72bc0746b79d/charlie_and_the_chocolate_factory_story_summary.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_off0000faa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA9 5372 bytes
SHA-256: da9b2fe5ce921338d0673ed0dc11f854c86b4942b2c0b51379687c463ec8375e
font_01_sfnt_off00010d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D16 11284 bytes
SHA-256: a427675aec7791d64121de06f809e1f8afeed6aae1db1cdb1802e9db13221dee

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