Malicious PDF — malware analysis report

Static analysis result for SHA-256 2895492ada5bbf77…

MALICIOUS

PDF

75.0 KB Created: 2021-04-03 14:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fcba65141da2373b00ccac03d1afac8f SHA-1: 0dc3cccb261a6b16a68b62b1f90c8f7aca593466 SHA-256: 2895492ada5bbf77e8275ec92081aacd0a5b4a1211d8282b8030ab83814765a6
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains a large number of external links, indicating a link farm or redirection mechanism. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://leonvi.ru/strik?utm_term=pressure+cooker+or+slow+cooker+which+is+better PDF link annotation
    • https://cdn.sqhk.co/mugejufunij/bjfy49j/rc_flight_simulator.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/icjdaEG/vanizisagemaja.pdfIn PDF document text
    • https://cdn.sqhk.co/pesamelez/YOm3jjh/wadogabopa.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/jgjij3R/braveland_wizard_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/gojinuma/QifoRLl/jazigovijafoge.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/buluvuraduxenub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_da11254f97a941618f745a157b356c78.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vapite/construction_site_inspection_report_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67928e18-69a0-486a-aab9-a97f17b6b1fa/8272993506.pdfIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_aa7cfc5d05df4c48b8f57ee2aa954600.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8bfafcb-2a4a-49f7-9486-d427270aabff/tudisufavufojobemafarug.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/sebinamav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f20842-1bae-48ef-a436-bb7494778f64/descargar_manual_autocad_2018_espaol_gratis.pdfIn PDF document text
    • http://sujawokasafu.onlinewebshop.net/babypips_forex_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53fa25e2-b054-4884-bcab-593667e04a48/how_to_draw_a_realistic_dragon_full_body_step_by_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7b8f38e-8227-4ea9-929d-c2e91f287d70/43601972281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf3a8a4-8b44-4b68-b1ac-0ca14f01e9c0/78104078251.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_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 4976 bytes
SHA-256: dcc5816fdbc936be9b387924c88b80d4c535aecfaa0b849bfea2305c28993d83
font_01_sfnt_off0000faaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 10908 bytes
SHA-256: 2b88a70d5d191843538bdcba60a5b824f6bffb6b1628c37a0b314b4676e3dd65

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