Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6c095261402ab6…

MALICIOUS

PDF

80.7 KB Created: 2021-04-10 03:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1435e1db80ac6cd8985f1fe58c38761 SHA-1: e68d3ff269d54c3dbc832945763e3a48ddba471a SHA-256: cf6c095261402ab6eedf602dca08125ce1ea6db0bd051cced6c9156aabf7a1de
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=can+you+download+inkscape+on+ipad
    • https://cdn-cms.f-static.net/uploads/4373755/normal_600b30b9b6984.pdf
    • http://raxewapikeb.mygamesonline.org/induction_melting_furnace_design.pdf
    • http://fapubozapanez.iblogger.org/what_book_comes_after_the_color_of_magic_audiobook.pdf
    • http://fisuruwibowin.66ghz.com/jesus_bleibet_meine_freude_organ_sheet.pdf
    • https://cdn-cms.f-static.net/uploads/4426832/normal_600fe62c5f934.pdf
    • https://static.s123-cdn-static.com/uploads/4372723/normal_5fe227241d60d.pdf
    • https://static.s123-cdn-static.com/uploads/4416131/normal_5fed45f957b4a.pdf
    • http://zawukinaloluku.sportsontheweb.net/english_small_alphabet_writing_in_four_lines.pdf
    • http://lidedapomegila.iblogger.org/guilty_gear_xrd_rev_2_character_guide.pdf
    • http://zanodopowe.sportsontheweb.net/livros_para_aprender_ingles_basico.pdf
    • https://cdn-cms.f-static.net/uploads/4473656/normal_60220451e5dc8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a3c73713-be4b-4c8d-a01f-dab92ecb4e1a.filesusr.com/ugd/5df860_dc5478583d1048ac9b7039a1213f3436.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4048be29-94d0-4ba4-aa62-8929c39d2d8e/how_to_become_an_occupational_health_and_safety_technician.pdf
    • https://b09d99c6-da67-4e55-b5b3-baceba093817.filesusr.com/ugd/a69c6c_76a17fbccfdb4583a518fb80ab66e7a3.pdf?index=true
    • https://9b321a86-0615-40a7-b684-6dced782f4cc.filesusr.com/ugd/e3cae3_bb6345decb9f4e1286f7645fd904f127.pdf?index=true
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_aed39ebb34994ce8a9297dd5af1e24f1.pdf?index=true
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_62727576a39047e79f6f9b9f49d17f10.pdf?index=true
    • http://lapabogi.rf.gd/cervical_cancer_staging.pdf
    • http://pasifowon.atwebpages.com/75224078689.pdf
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_917646fdb90140f88b56da58bd645388.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8e86fe2e-437a-48d9-9525-b08f94c0eeca/39725423198.pdf
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_ee88cd92fed043439088e88f93f57f9b.pdf?index=true
    • https://7322f44d-5cb7-45f5-8521-a79093f6ce74.filesusr.com/ugd/dd0890_69764b8070f6422aadb1a72837602e5c.pdf?index=true
    • http://poxalurerozelak.epizy.com/95826457920.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_off0000ff8c.bin
f0577b6c83874f1093bf96bd0afca1da3658aa7f839eeda90bc6ed5bfaba749d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 5136 bytes
font_01_sfnt_off00011131.bin
b8da9f964a2abc20493d30e6469b6d0a4cbddcd5ac5cbd41fa4e574442b94525		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 10756 bytes

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