Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c1b6528b73d422…

MALICIOUS

PDF

77.5 KB Created: 2021-03-20 22:57:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5ecdea584fa6b2a8ac4e6946819b0418 SHA-1: 21dee2c059d79e2046a7c47ef6f950772c412a7b SHA-256: 39c1b6528b73d422f46e359f96fe59c128144ea8895992d85c8382e9bb67cecc
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting services and are associated with link farms. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the PDF is designed as a link farm to redirect users to potentially harmful content. No scripts were extracted, but the primary attack vector appears to be social engineering through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://midufefew.ru/award?keyword=body+parts+name+chart+pdf PDF link annotation
    • https://cdn.sqhk.co/vuwonesi/Jhbysid/86801665880.pdfIn PDF document text
    • https://cdn.sqhk.co/palazawu/SEgNrne/60557677690.pdfIn PDF document text
    • http://zokuwazuza.22web.org/difference_between_rockwell_and_brinell_hardness_test.pdfIn PDF document text
    • http://whalesqpa.fun/the_life_we_bury_plot_summary6ykqq.pdfIn PDF document text
    • http://nokekowukubu.22web.org/zofoletizogefod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418981/normal_6013391225fab.pdfIn PDF document text
    • http://lovasosirukes.iblogger.org/generate_test_coverage_report_using_maven.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/gduFzPh/zinoruxufu.pdfIn PDF document text
    • http://trelon.fun/gililorazixo9tyme.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/9jbVbHu/ludo_king_for_pc_windows_8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491152/normal_6001aa4286298.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470692/normal_5ffbf58e57efd.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/giigjd9/cash_app_sign_up_bonus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bajapovogam/digital_economy_act_2017_data_sharing.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/35473389328.pdfIn PDF document text
    • http://lipaxunuvevi.epizy.com/gowapesajad.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/28614161178.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 5252 bytes
SHA-256: d034515a5209684f328e2e3d56f49161bdf5e3b8cc81e32346552f04a0e38436
font_01_sfnt_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 11000 bytes
SHA-256: ebae261a17e189380bff39b063f7cbffe465f3f7fa8592ce5fd7bf9c94fdd27b
font_02_sfnt_off00011af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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