Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5981f67f3b8c6e…

MALICIOUS

PDF

138.1 KB Created: 2021-04-02 16:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ecb2d7820a6c35236b18bfbb96fc9528 SHA-1: e293d83a0ff0256842efe70f98916b7559068164 SHA-256: ca5981f67f3b8c6e22d7a1429bc4841e71363a7d8ced5658b6c372627c18e594
186 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to trick users into providing sensitive recovery information. While no scripts were explicitly extracted, the presence of multiple external URIs suggests a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://botokaw.ru/award?keyword=ad+hoc+network+vtu+notes+pdf PDF link annotation
    • http://budofibo.mygamesonline.org/how_to_begin_a_paragraph_examples.pdfIn PDF document text
    • http://tehnikator.ru/vozepesisurorr771h.pdfIn PDF document text
    • https://cdn.sqhk.co/fezifoxunif/BqjhGvJ/vimomepewojebototogopupup.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/hggihVH/71605359117.pdfIn PDF document text
    • http://zapegerebipe.22web.org/nimerusetuxa.pdfIn PDF document text
    • https://cdn.sqhk.co/rujoremebi/hujgrbW/redsun_rts_strategy_pvp_mod.pdfIn PDF document text
    • http://homearfes.com/how_do_you_know_if_a_cold_is_viral_or_bacterial84o4m.pdfIn PDF document text
    • http://greatmasters.biz/how_to_reset_maintenance_light_on_2014_prius_plug_inq6ozw.pdfIn PDF document text
    • http://lumacy.site/naxawomumamerotizepkzozg.pdfIn PDF document text
    • http://mgacessoria.online/xizijuzor182fy.pdfIn PDF document text
    • https://cdn.sqhk.co/finulepaf/jeggxhi/traduction_fichier_allemand_francais_en_ligne.pdfIn PDF document text
    • https://cdn.sqhk.co/denalivek/3fjdEic/funufode.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/OdgiWjb/retro_racer_coffee.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_d0893f9349f7447f8c88388e22e64815.pdf?index=trueIn PDF document text
    • http://lowavizoviwu.epizy.com/architectural_lettering_practice_sheet.pdfIn PDF document text
    • http://jabejanaboz.atwebpages.com/lumera.pdfIn PDF document text
    • https://be1b941d-c88c-475c-9260-a39c9d088d9d.filesusr.com/ugd/5c562d_5b146e7660024f46b58fe86698471ff8.pdf?index=trueIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/28572453901.pdfIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_92ab9b095efd438ca158c8a75866d560.pdf?index=trueIn PDF document text
    • http://sigamit.epizy.com/lovasemobezizelige.pdfIn PDF document text
    • http://lonesopuw.onlinewebshop.net/zoom_banyai.pdfIn PDF document text
    • http://kasilabupa.epizy.com/25632177459.pdfIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_14df92f00e04479982cd87cf33db99e2.pdf?index=trueIn PDF document text
    • http://jeduxotikeg.rf.gd/guwaxafutib.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_off0001d9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9FC 1652 bytes
SHA-256: cbaac869df634def0dc58977a5cd8cf315fed18216e9ed6aca7a5cc64580d8c4
font_01_sfnt_off0001e239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E239 5208 bytes
SHA-256: d266daa509cf8546a8e17aad645a6cedf02474ed6e8997cea96b8af6e358cf9b
font_02_sfnt_off0001f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F408 11124 bytes
SHA-256: 9d95eacece99f5a3c13d4fadabf5dc3e815680fe3c77be3ccc841cdffbb74b5b