Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf733bcef760269…

MALICIOUS

PDF

81.2 KB Created: 2021-03-10 23:12:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 724406dcda566eff5e3c146dfe35b9ac SHA-1: e9a187a44497e12b7887d24f3b32ada5fb675973 SHA-256: ccf733bcef76026992ade4af5809d89207689d0fc666aa13f0a362acb32755a0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The presence of a URL related to 'pdf to word document conversion online' suggests a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/award?keyword=pdf+to+word+document+conversion+online PDF link annotation
    • https://cdn.sqhk.co/pesuxitum/eAiaWgd/xovosuvupe.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/iivNIJq/88349950710.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/ggzji5u/76981098138.pdfIn PDF document text
    • https://cdn.sqhk.co/tefazaturar/gfxL2iY/lovecraft_country_episode_2_review.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/if7Bihk/clicker_heroes_unblocked_tyrone.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/0Uibggg/python_calculate_percentage_of_two_numbers.pdfIn PDF document text
    • https://cdn.sqhk.co/lojumisebu/gcGhgic/ben_10_omnitrix_power_game_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rifebonapesi/gfhkBg0/73577445860.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/PjgFigT/art_wallpaper_hd_tumblr_black.pdfIn PDF document text
    • https://cdn.sqhk.co/vifaduvej/hZuggyn/mesazenov.pdfIn PDF document text
    • https://cdn.sqhk.co/kalijada/0gi4DfT/samsung_notes_not_working.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_5dcaf036c47f4de3b29682caa9df9e03.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_ba46af8502c2487d9e11f1c2bbb41d69.pdf?index=trueIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_befec2e330c445859faf3abf7dea8a9a.pdf?index=trueIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_defa993f9e774570be1822a69421ec7a.pdf?index=trueIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_46c71872f14b4039a1ac1559945a45e6.pdf?index=trueIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_bcce3fb1a88e4be59f40e3434cc259fd.pdf?index=trueIn PDF document text
    • https://60ceb029-6f78-4d42-8ea4-15ca08d8077a.filesusr.com/ugd/857e61_d89abaabfb1f45428566647bf75a5fd1.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_4e04b6cc0e654dc5a2127f421a3e7b02.pdf?index=trueIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_7d8c4bd81214441690aaf1a11ca925db.pdf?index=trueIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_d3b71f5cfc264550a0a7e5835d94fbbf.pdf?index=trueIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_475efcdc2da1416bba388cc6dcba7102.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_7785743e7ea748049112dfa33045c79a.pdf?index=trueIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_d00e7dd18d98488bb1b7efb415164c24.pdf?index=trueIn PDF document text
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_44aa292f68f1430e9c44f6a127ff6ac3.pdf?index=trueIn 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_off00010277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 5108 bytes
SHA-256: 89c16f3868e649159737e20000ccbbf3eac67ab71f72fac9b3e4a7711a01a2a5
font_01_sfnt_off000113de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DE 10288 bytes
SHA-256: 60d2cf0c6d14f99b777e7090a49f6c9fc0872f6142592dd9cf9a1523cd8daa80