Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f82cd870b2486fc…

MALICIOUS

PDF

99.4 KB Created: 2021-04-02 21:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9e9a04f3aad4c7ea5a940ee8ce512f66 SHA-1: 571f827f55ff581a8d7752bb7a0873233dd60838 SHA-256: 1f82cd870b2486fc5059f64c50953e2d2d24bf5d1184b27a85cfda9fcbc4e205
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://vilenefex.ru/award?keyword=list+of+adverbs+in+french+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4505771/normal_60366081efe4e.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/renisarokuvamenubitv1ach.pdfIn PDF document text
    • http://winoorama.fun/fapebiwukivf0oz.pdfIn PDF document text
    • http://italysummer.fun/82395902129lkcvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483870/normal_602fcf0fa270c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421354/normal_604e85545e75d.pdfIn PDF document text
    • http://carishr.com/jakapuvofixugazetolag6p71o.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/1618a7c5-94f3-45c1-a729-3823420d54b8/kekumina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d59c6b37-408e-4e5a-8ca5-d5690ff86bb9/list_of_iatf_certified_companies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdf7d944-f0b4-4806-8a80-120bd43d62ab/warrior_cats_name_quiz_warriorcats.com.pdfIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_362d23b6cfb0422ba732447a0257f8da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed3bb8fa-59d3-40e1-9cc8-d3c148e0ec67/nojujotoxebomerixewibubaw.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_7c40f9898ab24a4e978907975b8c9be6.pdf?index=trueIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_3a86eaafbaf94cf48f804a424cd204f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a9b1439-e820-477d-bc81-d0f83f1c76aa/ibm_thinkpad_beep_codes_1-3-3-1.pdfIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_d7df8faf067345a9ac1e153ccd2a49fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51c682c5-de57-40ce-875b-db7eb34158a5/sony_cyber-shot_dsc-w800_digital_camera_with_accessory_kit_black.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_fff5b11e30374f6d8dc9943faa68410e.pdf?index=trueIn PDF document text
    • https://e222b685-7c7f-4cee-b050-218328c89257.filesusr.com/ugd/c0232f_e6eaea86ea564a059e8b14f8b1e14d63.pdf?index=trueIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_a09eacf6b77a455babe20a5c32d1ff8f.pdf?index=trueIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_26a11bc99de746b48e87f7358eaab1a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59099465-549c-4ddb-8264-7e5d1b80bb92/ham_and_cheese_oven_baked_sliders.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014f42.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14F42 27096 bytes
SHA-256: 83f6d1054ba22577ec658b85ad46c13de00e4cd367aa4c9dc00cb2d0eb614e1c
font_00_sfnt_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 9888 bytes
SHA-256: b6db25c36f143660df91fc9ba59e76742973f09f3017cbfbe3bef4db5c05d062
font_01_sfnt_off000117df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 5352 bytes
SHA-256: 22f5feef303cec02e79aff7d8eee06858952d5b9745cd119e52c172d9f8a8723
font_02_sfnt_off00012a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A15 10804 bytes
SHA-256: c03c0626f51797ef932b72e25d07ef7ab5ed78d85b403d0e760e795286abd8a4

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