Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dcf94a4bca09dd3…

MALICIOUS

PDF

76.0 KB Created: 2021-04-29 03:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0d1d3b5bb8ef3522599b9abcf886cb1e SHA-1: b3ad67c8119afc17e0d997081e39343d8144e90c SHA-256: 8dcf94a4bca09dd39c5f8e4f753f6b5fd91df2c9122034c4e2487da0d7c01dd1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://vilenefex.ru/strik?utm_term=girl+halfling+names PDF link annotation
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/230847.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/bijasusuru.pdfIn PDF document text
    • https://fipowawebes.weebly.com/uploads/1/3/4/6/134601566/lotemozamam.pdfIn PDF document text
    • http://mosasekoz.22web.org/rasetugopini.pdfIn PDF document text
    • http://pannochki-art.com/eagleton_ideology_of_the_aesthetic4cmie.pdfIn PDF document text
    • https://tuzutetenufiro.weebly.com/uploads/1/3/4/7/134716615/2337222.pdfIn PDF document text
    • http://paypallsecurity.com/xezekapodisimonosapuwomo6yxvv.pdfIn PDF document text
    • https://zefubolinela.weebly.com/uploads/1/3/4/3/134318842/5951446.pdfIn PDF document text
    • https://nakotugobal.weebly.com/uploads/1/3/5/3/135300729/9285855.pdfIn PDF document text
    • http://richteam.site/babbo_italian_eatery_nutrition_informationx43y7.pdfIn PDF document text
    • http://stepka2016.xyz/musijutiperokivafuridivy8t1r.pdfIn PDF document text
    • http://hurricane1.space/schaum_differential_equations3wcqn.pdfIn PDF document text
    • https://kusawagefeduzuj.weebly.com/uploads/1/3/0/8/130874333/0fa7989a.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/fosawef/korinakatadokora.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/how_to_get_beta_symbol_in_word.pdfIn PDF document text
    • https://d6a293f2-6876-493d-91b7-c13182b05023.filesusr.com/ugd/bcaa7e_194b66175b6c46088a22c3167f5c47f8.pdf?index=trueIn PDF document text
    • http://gebaruzowulidus.epizy.com/what_is_the_chronological_order_of_avengers.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/61383319083.pdfIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_78adc025048c4281830b3d81fdc233e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/aquamarine_full_movie_for_mobile.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_off0000ebff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFF 5212 bytes
SHA-256: 51be1ba460d1d067dba207ef1985ff734b860fec9be03501797faf28fa172076
font_01_sfnt_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 11004 bytes
SHA-256: 7b33747a015697fe497fe78a61f76ea8daa6094c00de87212754302916c426d8

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