Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfbdc5c95fd6b96…

MALICIOUS

PDF

72.5 KB Created: 2021-04-06 23:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8113417db235f6c6e1ab6c383cf0ca79 SHA-1: 9f2f2b9dcb472c0711116936bb729dfe72b86a76 SHA-256: 7bfbdc5c95fd6b9609d0b179f72a1e136dba7b01925f6c8336bf6a9513b2b781
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to malicious websites for further exploitation. No scripts were extracted, but the PDF structure itself is used to host malicious links.

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/award?keyword=arquitectura+de+computadoras+segmentada+pdf PDF link annotation
    • http://gedirobidepud.scienceontheweb.net/jufadonuxaxofi.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/25528228396.pdfIn PDF document text
    • http://jexekiraj.sportsontheweb.net/slavery_by_another_name.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/428490061518qwqs.pdfIn PDF document text
    • http://rabusog.22web.org/jowazuletubavefazegufaxe.pdfIn PDF document text
    • http://circus.market/21473376058o4lww.pdfIn PDF document text
    • http://latitekiwa.scienceontheweb.net/tom_clancy_the_division_ps4_cheats.pdfIn PDF document text
    • http://koolmaxt.online/atonement_chapter_10_summarym6lp7.pdfIn PDF document text
    • http://gosunenibunale.getenjoyment.net/83134916354.pdfIn PDF document text
    • http://luzupogakij.sportsontheweb.net/english_to_japanese_dictionary.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/nabavoki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_cafb2973f4a645e99e8734189522634d.pdf?index=trueIn PDF document text
    • https://6dd05bf8-a32e-4ce7-8057-9a1894012cff.filesusr.com/ugd/4ce960_194812d528d946acb2b2ee933598f069.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lumixi/xazivimiperopijilerobipi.pdfIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_6aec40e4854c402d85acdbd2975fd92c.pdf?index=trueIn PDF document text
    • http://jamujufumazuwir.rf.gd/16655988573.pdfIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_e3da2183edd64dca87fa71c3c3636520.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomogas/filixokititepubilaziwex.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_off0000dc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 5560 bytes
SHA-256: 3c4b250b747974fcdb9b409eaab2baa9d60e001f48f7b824c5a508793643cd3c
font_01_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 10936 bytes
SHA-256: b280dae27dc80a1f6a227131c4eb9d37754427525ccbeb93bb39da9db431c565

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