Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabbff67214119f4…

MALICIOUS

PDF

80.4 KB Created: 2021-04-20 14:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 21a09ca7fbf208d9a71d547ff7ed2520 SHA-1: f1b70289a7ebc328310ee8c81c72d9bf41bd16be SHA-256: aabbff67214119f435184f838e0e9d0b0a70916ca9c2349de2e1d5c4e9a7109e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' containing 30 external links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the presence of external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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=the+sign+of+the+chrysanthemum+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413575/normal_5ff292af99174.pdfIn PDF document text
    • https://cdn.sqhk.co/bixevemaxi/cghyjjd/merisuvowu.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/hOh8ge5/2043688160.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/fcgiOu9/video_downloader_chrome_mobile_extension.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/icgjYSA/42860543416.pdfIn PDF document text
    • http://xelipev.22web.org/86974777519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_604e2fc800d3a.pdfIn PDF document text
    • http://ragesedanem.iblogger.org/85206145066.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c20a02f1-eded-46de-afbf-2d7328e03b26.filesusr.com/ugd/c6fd25_c64a5333408a40a68157d6632dd1498a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fivebo/lepudenuzonerif.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/ipod_nano_7th_gen_review.pdfIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_66aaea6a37b441a5a97197238e64da1e.pdf?index=trueIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_cab2332adf054960afd0759559134eb1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jozaponi/7z_file_extractor_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/compressed_gas_safety_data_sheet.pdfIn PDF document text
    • http://sijuzoratimi.epizy.com/digestive_system_of_arthropods.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/4276765775.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/childish_reverie_font.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/bissell_little_green_machine_hose.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_eed8c366b4164ad3b667adbbf77069d3.pdf?index=trueIn PDF document text
    • http://bezopiwuzalobit.rf.gd/05_nissan_murano_starting_problems.pdfIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_c83af342ef784977b6e8e8e266a28f5c.pdf?index=trueIn 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_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 5588 bytes
SHA-256: 4ebdc98f1c3928545f61ce8b61438a92e652dbb74beff7b03e2b0fff117618d5
font_01_sfnt_off00010e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E26 11100 bytes
SHA-256: 4701181ca0411a19134c72942e1c24714ad19abae3786a2660a9e5377e5a53fb

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