Malicious PDF — malware analysis report

Static analysis result for SHA-256 7930f583ab542aab…

MALICIOUS

PDF

77.6 KB Created: 2021-03-29 11:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1d3ac86f31661ed81239e8e2bf4785e4 SHA-1: 8a4182776d507ffe8909a94ee75653a2e2ae4616 SHA-256: 7930f583ab542aabdc25fb3227fb6623c94a6abba1fb4c1e2a72a3ef74f0beff
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest an attempt to drive traffic to attacker-controlled infrastructure, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=what+are+the+8+stages+of+growth+and+development PDF link annotation
    • http://kudonolenukiv.22web.org/53761663072.pdfIn PDF document text
    • http://movivuvafozor.iblogger.org/58919358527.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/ohi6uh3/the_ordinary_skincare_for_acne_marks.pdfIn PDF document text
    • https://cdn.sqhk.co/fejukomus/egeiieD/hitman_s_bodyguard_album.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/iifP2ii/find_friends_online_free.pdfIn PDF document text
    • http://bella24.xyz/18016796652pq6ft.pdfIn PDF document text
    • http://igclienteam.com/cessna_172_service_bulletinsnijhs.pdfIn PDF document text
    • http://d2-club.ru/pokew2eslh.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/aVbgjtD/rosodabujaduvejuxose.pdfIn PDF document text
    • https://fadasizoguwo.weebly.com/uploads/1/3/6/0/136050507/bujojiferil-zijexo.pdfIn PDF document text
    • https://morutasatosode.weebly.com/uploads/1/3/4/3/134366393/xejujasakozof_fopatonujudoti_fetaredun_naledojesosa.pdfIn PDF document text
    • http://dusogewosat.iblogger.org/drop_shot_fishing_rig_for_speckled_trout.pdfIn PDF document text
    • http://stankovit.ru/dutch_sheets_intercessory_prayerjiv6z.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/tiluwisulepam/porter_cable_pancake_air_compressor_drain_valve.pdfIn PDF document text
    • http://velidukaka.epizy.com/vefogimevogowujibuwefane.pdfIn PDF document text
    • http://nawonarubital.epizy.com/ammonium_dihydrogen_phosphate_msds.pdfIn PDF document text
    • http://nalokematu.rf.gd/webixurazanikosojidoxezug.pdfIn PDF document text
    • http://xitutudatiri.epizy.com/ullathai_allitha_padam.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/kegipuvovuf.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/akbar_birbal_ki_kahani.pdfIn PDF document text
    • http://kifobidurusidi.epizy.com/10729856019.pdfIn PDF document text
    • http://bozawozu.epizy.com/attribution_theory_heider.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_off0000f07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07F 5812 bytes
SHA-256: 2317c279dca552b7b3e88bbdca6b6b4d7f45011264c758e0e9b96d0a9339295e
font_01_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 10724 bytes
SHA-256: 246f2cf3fdba771a518d1904da457484157f5bf438f8132ba6955e6b82582488

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