Malicious PDF — malware analysis report

Static analysis result for SHA-256 0529441cbe6bfbe7…

MALICIOUS

PDF

76.0 KB Created: 2021-03-25 15:04:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 187102d3293421db14731740b4d0bc63 SHA-1: 87b17d52bdf35b1af0dd6b90281d7fb9f6e2ffd6 SHA-256: 0529441cbe6bfbe702d49bd2fe99fe137639e119125aed03635696b519e791ed
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains and identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The primary attack pattern involves directing users to malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=break+night+party+meaning
    • http://bedating.online/37371265341k6y6q.pdf
    • http://ribavid.medianewsonline.com/98752816755.pdf
    • http://atomyimperial.ru/55232457049zgrnt.pdf
    • https://bisaderivulele.weebly.com/uploads/1/3/4/7/134744485/2b471d0f44.pdf
    • http://vabenawak.iblogger.org/voxaboleraterav.pdf
    • http://womizepivilora.sportsontheweb.net/60875275628.pdf
    • http://funuretebinuzos.iblogger.org/casio_illuminator_watch_instructions_3198.pdf
    • https://rusigeju.weebly.com/uploads/1/3/4/5/134596119/gexelijege-gumepet.pdf
    • https://ruzudagozigiwis.weebly.com/uploads/1/3/5/3/135394236/baripiwe.pdf
    • http://mopewogubit.getenjoyment.net/1129060259.pdf
    • http://mpvideo.org/rv_heaters_not_workingviu6v.pdf
    • http://nabavawuzafurur.mygamesonline.org/mupopewit.pdf
    • http://lirinevewafa.mypressonline.com/pdf_file_editor_app_download.pdf
    • http://net-klientov.ru/lofolujewurabutowopntw12.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_fb261c97011349528f43e5e808530546.pdf?index=true
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_0cb2d52eb01b477aa7e2297ee923b902.pdf?index=true
    • http://womagemav.rf.gd/does_usps_forward_mail_internationally.pdf
    • http://salajire.onlinewebshop.net/josuvekizaxonitamivi.pdf
    • http://vorisenunajix.myartsonline.com/lexus_rx_350_suv_2019_price.pdf
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_00e36dff65094210addb99b9db738b3c.pdf?index=true
    • http://gagivipupine.epizy.com/72433891442.pdf
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_62c7c96a541e48b6b417cf3e65209e60.pdf?index=true
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_6af3271d6484417fbb3e24e767cf1798.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea47.bin
ffaef31c914f0e3941fe180ebb0a352cfed883bbc55d870734ea8ef9865c84d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 5240 bytes
font_01_sfnt_off0000fbfb.bin
a710ce8aa065e6b17f00309132407f9f0884d5a1a6c1c08309de40b3c2c16b4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFB 10772 bytes

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