Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9bcefd6db871d60…

MALICIOUS

PDF

86.1 KB Created: 2021-04-02 23:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b0dc5d6e4c6225273f57ce8474a731ba SHA-1: eedb97e4cfcc4bad407f357a8c4e7eb3239aca70 SHA-256: f9bcefd6db871d604737be8e8ac7069c29a66682fb7e9599ebd374855bc51a45
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques, likely involving obfuscated JavaScript or embedded exploits to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/award?keyword=annuities+lecture+notes+pdf PDF link annotation
    • http://voiprormul.xyz/xivunafilutazaxalelapidef3qyqf.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/gIjiZ9k/ludo_star_2_2017_apk_download_old_version.pdfIn PDF document text
    • http://laxana.ru/bawli_tared_dj_remix_songkev17.pdfIn PDF document text
    • https://sovufejado.weebly.com/uploads/1/3/0/7/130740048/xatujiru-netapujaj.pdfIn PDF document text
    • http://adanakebap.org/49291848914kiffr.pdfIn PDF document text
    • http://bluebadgeform.com/89812456696o1xu7.pdfIn PDF document text
    • https://demimawuna.weebly.com/uploads/1/3/5/3/135389973/tanuzapiriwitax.pdfIn PDF document text
    • https://cdn.sqhk.co/lupokuna/ggKCxhj/word_cookie_daily_puzzle_october_15_2020.pdfIn PDF document text
    • https://bugasezafefadi.weebly.com/uploads/1/3/1/6/131637254/dabbb3a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jovekus/87473221783.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/13571623365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb86c82-0b6a-4931-9761-7f1e69b4da5a/rifasanonuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d34de885-d756-4611-8422-bc52760741fc/nekafejununigokupexogiki.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/comic_book_page_template_psd.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/5138171150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/632aa593-dafc-4043-ac8e-94efdb4522ae/pejasudaxezodewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e5261c-3238-4c2e-8c3b-fabe8d338d00/onkyo_tx-nr616_7.2-_channel_network_a_v_receiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c097397-5f60-4ace-89eb-cde4d0d090eb/samsung_dvr_sdr-3102n_password_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/are_piglin_trades_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d46215cb-1d5d-459b-ba57-c158683e7a8e/87044395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c6f0a7d-9ad1-4e9c-8e78-4c9f3c9d4b42/how_much_do_pawn_stars_get_paid_per_episode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7db3baa-0fad-4ac1-a88f-24220d2d53b7/where_to.donate_clothes_during_covid.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_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 4928 bytes
SHA-256: 7a2dee97c55abe79cc2ffeb695da48682a1948a5c6eb829e09cddbba036d6dc6
font_01_sfnt_off000123c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C0 11608 bytes
SHA-256: a07ac347ef2c45704cc2a04642815fc2d047b5b9022ab578a07d48f9dc5f5156