Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df65a04fa25a889…

MALICIOUS

PDF

82.4 KB Created: 2021-05-13 10:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4c61b1673e9e4932d49a34fc3e92617a SHA-1: 2ada298b2c841a4c040cd6742ac9337ed12f6428 SHA-256: 1df65a04fa25a889f187ab0d07ee7e1d6e4ad8ce093373a43dbca96cfddcd5ee
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'Dunkin donuts cappuccino nutrition facts' and 'wkhtmltopdf', indicating a potential lure to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=dunkin+donuts+cappuccino+nutrition+facts PDF link annotation
    • http://gavokofubafixi.getenjoyment.net/disevubilogobidojedasos.pdfIn PDF document text
    • https://xaperosojemi.weebly.com/uploads/1/3/0/9/130969510/vudetufasakuwon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461485/normal_606e2006bb91d.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/phfpbja/41728106427.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366666/normal_5fca45d9f267a.pdfIn PDF document text
    • https://cdn.sqhk.co/vivijuzajus/bOhcBHa/98146656268.pdfIn PDF document text
    • https://cdn.sqhk.co/rolidofajug/2XODcCD/custom_maps_minecraft_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/deloreba/gghfs3A/nick_jonas_new_songs_2019.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/sql_server_2020_new_features.pdfIn PDF document text
    • http://wewofif.scienceontheweb.net/sefojupu.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/67218850209.pdfIn PDF document text
    • https://cdn.sqhk.co/pobefozo/d2Asiam/adobe_photoshop_cc_2014_free_trial.pdfIn PDF document text
    • https://lenudigibelap.weebly.com/uploads/1/3/7/4/137499492/donuxezokitod.pdfIn PDF document text
    • https://liwigudujonaj.weebly.com/uploads/1/3/5/3/135383521/6711d.pdfIn PDF document text
    • https://cdn.sqhk.co/wogirujut/ggW79jO/fifilenabolipabufiwupiwus.pdfIn PDF document text
    • https://cdn.sqhk.co/sugutomipu/gd0gghi/oscar_the_grouch_meme_vietnam.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/shoprider_valencia_mobility_scooter_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/pibilebomek/cOifu94/samsung_galaxy_buds_plus_warranty_check.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/cashflow_quadrant_full_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wojibikifi.myartsonline.com/refraction_of_light_through_prism.pdfIn PDF document text
    • http://baletax.onlinewebshop.net/hp_laserjet_p1006_download.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_off00010489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10489 5180 bytes
SHA-256: fe5d65edd911cff255783529a76b1938d1e5055fb8263c54853363a791ba02b2
font_01_sfnt_off00011646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11646 11112 bytes
SHA-256: 2afc1d09341a351dde28986912b2ef8b73dbe669b58dc9de5b059d08b4834d01

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