Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f431021a9a0b463…

MALICIOUS

PDF

72.9 KB Created: 2021-05-22 11:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3a03efb633a012dbce836665c082cf55 SHA-1: b1a793d1c6f4b95037f8607afe320cfb14d04d14 SHA-256: 6f431021a9a0b463d1bdf018c0d101e96ec9de0a4886dc236b5d749a457efdac
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule indicating a large number of external links. The ML classifier and ClamAV also identified it as malicious. One of the primary external links, 'https://baarspo.ru/strik?utm_term=ltd+ec+400+vs+401', is suspicious and likely leads to a phishing or malware distribution site. The document body appears to be corrupted or heavily obfuscated, preventing a clear understanding of its direct content, but the link farm suggests a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=ltd+ec+400+vs+401 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485821/normal_6001678d8ace6.pdfIn PDF document text
    • https://rorefogalo.weebly.com/uploads/1/3/0/7/130776605/3937637.pdfIn PDF document text
    • https://wowaximemufa.weebly.com/uploads/1/3/1/4/131453960/jejujigowarogisoban.pdfIn PDF document text
    • https://nogomikosisodop.weebly.com/uploads/1/3/2/6/132681488/e41a619894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415537/normal_5fe732080f8f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a475bae8-536f-44ad-8af4-d47f47af4a5b/stryker_stretcher_mattress_replacements.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/veterinary_zoonotic_diseases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6713cbd2-e9ae-4992-b387-bf5a4fd1b32d/mofimakusubaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ee03435-d419-4fda-860a-fdd4c96e231f/montgomery_ward_sewing_machine_manual_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/new_bollywood_full_movie_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/11214706650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b67470-c4b8-4dfb-8d00-feccef612e78/how_to_help_stop_climate_change_as_a_kid.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/bollywood_old_movies_hd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/la_iliada_resumen_canto_22.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07933097-eed0-4d37-be98-b9d24ef6f0ed/what_chapter_does_jack_hit_piggy.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_off0000dc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 4876 bytes
SHA-256: addd801583c7f993813b1b1eeec25a1f54c2a5db6f844cea6d07375321aeb3e6
font_01_sfnt_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 13028 bytes
SHA-256: b92b861abff8ab6c0a92b8be2024df708152cf876a9fc36bfd31145a0c5f3bde

Open this report in the interactive analyzer, or submit your own file for analysis.