Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc541ce8fc5f2ff…

MALICIOUS

PDF

81.3 KB Created: 2021-03-09 02:58:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c278755583fad513fd8cd9e46531e8dd SHA-1: 6b31b683a93977eecf9309910311624774ff4115 SHA-256: dfc541ce8fc5f2ffccc4be21a15806be1aa2ff5aacd7364db7cc9e6e1b81bb77
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the structure of the PDF point towards a tactic of using a seemingly innocuous document to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://baarspo.ru/award?keyword=amway+all+products+price+list+2020+pdf PDF link annotation
    • https://zomereke.weebly.com/uploads/1/3/5/3/135397468/jakufix.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/jHjbrjc/24076213850.pdfIn PDF document text
    • http://funseeds.site/how_much_for_adobe_suitebji37.pdfIn PDF document text
    • http://fitnesspack.net/jesekuxisomuzuwiluxelirii1uw.pdfIn PDF document text
    • http://daating19.site/flight_simulator_2018_flywings_android_1af99t.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/30691803425ngvj7.pdfIn PDF document text
    • https://cdn.sqhk.co/tikisudolo/gcrgiie/pudanovitosesozo.pdfIn PDF document text
    • http://erogan-encolumbia.site/94712893662imcqe.pdfIn PDF document text
    • https://forugizatufuru.weebly.com/uploads/1/3/1/4/131410167/tekolujesopazuwevul.pdfIn PDF document text
    • http://magnetfix.store/988263932218tfpf.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/guhaQgh/famous_prank_video_call_with_celebrities_celebis.pdfIn PDF document text
    • https://nosovaranipad.weebly.com/uploads/1/3/4/7/134743093/878757.pdfIn PDF document text
    • https://cdn.sqhk.co/fojupigek/MUrVgef/40381456232.pdfIn PDF document text
    • https://tinonerapize.weebly.com/uploads/1/3/5/3/135349756/titemomob.pdfIn PDF document text
    • http://govnosiakxws.online/71850908043bam2p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_46c71db40ddc459f81f7d7f07e47ac60.pdf?index=trueIn PDF document text
    • https://a7176590-a44a-43b4-8b25-1171fb6190ac.filesusr.com/ugd/e6ccb8_ab705ca63b1848178f7b8742acc71d88.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/653db3f3-7792-470c-8cf3-5d452a0e9e17/13580930859.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_65c18635fd7747a3bfbbda59d858d6d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90e068fa-dc55-4a6e-9206-8c65c7fef831/gutizomenukexifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a095e16-21cf-4eee-84a5-85098aa4ce54/37579642567.pdfIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_1c0a6bf0824a42ccaa8af7abf2563d97.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_1d5569cbb56143b7a6be63d558444fac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f99cbb7c-3d40-4be2-9f8b-846912cfc8cb/95417761431.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_off000100e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 5756 bytes
SHA-256: 622ded2b325f1956561d68102d00642a951f4a925e923389a28e6ece6824f97b
font_01_sfnt_off00011483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11483 10212 bytes
SHA-256: bec8ba292cb4ff32313dacbfd6e32a0166e1f10e4d9eb9e8eff1d8901aec9c7f