Malicious PDF — malware analysis report

Static analysis result for SHA-256 f480a875bc3f0d00…

MALICIOUS

PDF

75.3 KB Created: 2021-03-23 07:54:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a9c3e870ef531b43415268170a0e31d9 SHA-1: c964b356e0864e978a0c65a3ea4c663bc7935087 SHA-256: f480a875bc3f0d008d63345feef1f9d5485c3d5df544dc149f0221162e4c9e3a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence heuristic identifying it as a link farm on disposable hosting. One prominent URL, https://botokaw.ru/strik?utm_term=sparklebox+gingerbread+man+story+map, is flagged as unknown reputation and is likely the primary malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

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 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://botokaw.ru/strik?utm_term=sparklebox+gingerbread+man+story+map PDF link annotation
    • https://cdn.sqhk.co/zoxunoromi/ifige6a/zuzeganirisole.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/how_to_do_a_fashion_technical_drawing.pdfIn PDF document text
    • https://cdn.sqhk.co/dedomafub/8vT8Nge/smart_girl_hashtags.pdfIn PDF document text
    • http://boguzimaro.getenjoyment.net/41610233620.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xunudijumo.myartsonline.com/laminated_object_manufacturing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c4ad37e-1eb2-47fb-a491-5d59a1eb9207/tidikiv.pdfIn PDF document text
    • http://bopiguxa.atwebpages.com/best_alesis_drum_module.pdfIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_9166a07ec66f415ba5cec306b339b242.pdf?index=trueIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_05f59c5efd014f65bb409fd732f4bd91.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/pevipufetewowepuzexugam.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/free_printable_bass_guitar_chord_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1adb9a7-8d94-4f82-87fa-facd5096040b/pimifi.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/61383147610.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/kindle_fire_hd_7_case_2nd_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/debc97b0-61aa-4973-8f94-86abb16d6530/presto_food_dehydrator_recipes.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_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 5756 bytes
SHA-256: 3b935f309e6ee5bba52ffb5ddac4d117c4cfab2481299351127a116a4dde4a58
font_01_sfnt_off0000fd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 10220 bytes
SHA-256: 4ca145930058989daf8c7bfb633e967e197b069d0ca74eaf88badea08d00a618

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