Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06bd4b2ed8f9d77…

MALICIOUS

PDF

64.3 KB Created: 2021-02-19 13:21:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f7c33b111cb8dbcb80ae80430dd4f150 SHA-1: 34c6da76cbbabe2c2bae0563938a73b24c45ff54 SHA-256: c06bd4b2ed8f9d77b73d6c65aa8a7180af7f2850a8ee35a1fc69bde2f781f3de
66 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to an 'instruction manual', likely to trick users into visiting malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://baarspo.ru/wix?keyword=irritrol+rain+dial+instruction+manual PDF link annotation
    • http://latencfsrt.space/padma_purana_in_malayalamcy98u.pdfIn PDF document text
    • https://zolulosix.weebly.com/uploads/1/3/3/9/133986826/7a5907bf4b2b2fc.pdfIn PDF document text
    • http://gowitobo.iblogger.org/assume_form_lyrics_traduction.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/iahgVhf/sudomolofudori.pdfIn PDF document text
    • http://shoppingyxplus.xyz/ccna_routing_and_switching_complete_study_guide_200-1254p7kc.pdfIn PDF document text
    • https://cdn.sqhk.co/jobezivozuf/fZZvONk/89431118758.pdfIn PDF document text
    • http://azorocheat5.xyz/capital_punishment_ielts_reading_answersr2z1k.pdfIn PDF document text
    • http://connexion-amelii.xyz/sudalobxd8p.pdfIn PDF document text
    • https://kokozorakozuwel.weebly.com/uploads/1/3/0/7/130775651/negufedakabutosiked.pdfIn PDF document text
    • http://4kuhd.me/bibugixofijokodadizqi70.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tobisijukufoki.epizy.com/wuxefodageposugasolagup.pdfIn PDF document text
    • http://tepusijanakigat.epizy.com/guided_elk_hunts.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_off0000c005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC005 5020 bytes
SHA-256: 8e511a3e635673182cc6d68312e54d058ea00da13ad704ef97334e4c4f78aa64
font_01_sfnt_off0000d0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FD 10428 bytes
SHA-256: 7386dea1059432dd1afa52e5288bf5429f51bbad499b2a58beeb91c557b47fd8