Malicious PDF — malware analysis report

Static analysis result for SHA-256 939c44afdb47be91…

MALICIOUS

PDF

94.5 KB Created: 2021-02-28 17:30:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6b34dc59eb27bbadbe24c0643ff3db8b SHA-1: 7961d2497381bcb221b59ce7c2ee41f17763507c SHA-256: 939c44afdb47be91c5586b60ac7af1caf325f1a02c5873d23c58a95dda2ff744
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by heuristics as a link farm designed for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing site. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=what+is+the+features+of+feminist+literary+criticism PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426819/normal_602fbfae36854.pdfIn PDF document text
    • https://luvoseguz.weebly.com/uploads/1/3/4/6/134665560/032bbce9a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491936/normal_6009f7afcb909.pdfIn PDF document text
    • https://finamiwowekizo.weebly.com/uploads/1/3/2/3/132302732/5529661.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457320/normal_6009781f2cc94.pdfIn PDF document text
    • http://halfraire.xyz/ccleaner_latest_version_for_pckdsz7.pdfIn PDF document text
    • http://parrrtner.xyz/dish_network_remote_setup_to_tvesld8.pdfIn PDF document text
    • http://fruct.space/do_aquatic_plants_do_photosynthesishlb46.pdfIn PDF document text
    • http://fukijuwevo.getenjoyment.net/msi_z87-g45_ram_compatibility.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/how_to_determine_age_of_rinnai_water_heater.pdfIn PDF document text
    • https://simokenuma.weebly.com/uploads/1/3/5/3/135311421/d193e4cd3.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/pusuweturujasisi.pdfIn PDF document text
    • http://openplafond.xyz/togizutukovuruwejukedapo10v46.pdfIn PDF document text
    • http://opensalon.xyz/midipomelikidirazenos0spa0.pdfIn PDF document text
    • https://kugibunil.weebly.com/uploads/1/3/1/4/131437599/739ab307c8e9.pdfIn PDF document text
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/wefelepekosap_xitobusepevem_tadosewu.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/patilawasu/how_to_turn_on_minn_kota_i_pilot.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/are_ivy_league_certificate_programs_worth_it.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/85664696542.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_off00013413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13413 5236 bytes
SHA-256: ee27c9a3e33b5c5e0f306e4dd681ae9ed692d1d30ffd1afb3a302696e7a54d41
font_01_sfnt_off000145cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CF 11692 bytes
SHA-256: 6dd64e363ef5dbe79e6503e21e1e524e9109aaa342f2cb15b337ac6c572682ef

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