Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c8c7b79c8f41ad…

MALICIOUS

PDF

77.4 KB Created: 2021-06-09 10:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: be1f69a44d0a6a3ec6245d4d459b090c SHA-1: 690aa6e1b3505d09ac3f9e893f77a99ce0096926 SHA-256: 77c8c7b79c8f41adc3679ceb19c04f7c3533aaba6e9649abc5290959674b0bf9
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for link farms used in phishing campaigns. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

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 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://allytemp.ru/pbw?utm_term=th9+builder+base+link PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424341/normal_601e7db687676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426696/normal_6019571072092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421061/normal_60321cabce258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388046/normal_5feaec6b5c1c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473618/normal_6033f416bf00e.pdfIn PDF document text
    • https://wixifaxofosa.weebly.com/uploads/1/3/1/3/131398582/bosivisonividofarim.pdfIn PDF document text
    • https://pezibusogesa.weebly.com/uploads/1/3/0/7/130739584/893457.pdfIn PDF document text
    • https://sokimazivad.weebly.com/uploads/1/3/4/6/134620474/goboxonajoto-gemedevobag-tupaxasog.pdfIn PDF document text
    • https://jirorenuges.weebly.com/uploads/1/3/0/8/130874518/1df7632d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422659/normal_600832ea0a0f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390680/normal_6002ae55113ed.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/944b8bf8-7722-40d5-8525-db165eeea15a/fomolivujavad.pdfIn PDF document text
    • http://lururefisu.pbworks.com/w/file/fetch/144904812/jimogotabemonitisexusir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abd495df-4b8d-4498-ae94-0cc40205d7b8/27697471433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81034b4c-eb89-4a04-9523-a369ead3e689/how_to_get_ppf_maturity_amount.pdfIn PDF document text
    • http://zobafolu.pbworks.com/f/chrome_browser_for_sony_smart_tv.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/f/7343347852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a5d18b5-66aa-4bc0-92e2-7679833009f2/casio_pro_trek_prw-3000-1adr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2522fcf-73a1-4d6b-908e-4f34a0c580ef/jewofuzinari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38dafb89-3aea-4612-af98-4aa65b9ea809/febiloweleluva.pdfIn PDF document text
    • http://bovojigu.pbworks.com/f/understanding_human_communication_textbook_ebook.pdfIn PDF document text
    • http://vibasuvezuz.pbworks.com/w/file/fetch/144801681/how_to_change_battery_in_drayton_digistat_3.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_off0000efd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 5220 bytes
SHA-256: a66322efdc9e584aa8b249ce2ff7bcd7dbf30adce3ffd2305ac5bcf9bd78da8a
font_01_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 11436 bytes
SHA-256: a7ec15c939a4c55d1139fc2174a857b433b8b31c8f0338150e4be825b1f5a00c

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