Malicious PDF — malware analysis report

Static analysis result for SHA-256 bacdeb459f77e873…

MALICIOUS

PDF

89.9 KB Created: 2021-05-02 01:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 898e4d9a2b5bee0bc448d2f4883b3498 SHA-1: 2f21af5f4e19b792a3ed4bb12738f8b68ef97ed4 SHA-256: bacdeb459f77e873dfd702a5de221cbab19df6be68b9fa19832bf8544a16b3cf
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://soxebez.ru/strik?utm_term=constructionist+theory+of+gender PDF link annotation
    • https://fojexoduzasob.weebly.com/uploads/1/3/4/6/134693365/serekes.pdfIn PDF document text
    • https://silorofolukut.weebly.com/uploads/1/3/4/2/134265947/9109413.pdfIn PDF document text
    • https://xatefokagakutil.weebly.com/uploads/1/3/4/1/134108848/jezijujosulusa.pdfIn PDF document text
    • https://komomofuxuz.weebly.com/uploads/1/3/4/4/134494735/706002.pdfIn PDF document text
    • https://bubosetew.weebly.com/uploads/1/3/4/5/134515161/46d25ae0276d7f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426941/normal_60135e207f5e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450889/normal_601952aedef59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421207/normal_5fd28157ede9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366004/normal_5fe2a82f5a868.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/17956866850.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/4th_grade_math_vocabulary_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_4d1625f4ce0a4cc887f4a21b371a58bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/gomatidajixafa.pdfIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_ebeca52350b048379a52bc81bed77334.pdf?index=trueIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_a2be789070924145beea4ecbdc5e69b1.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_c3a84bae8b6b4704919576f124119f74.pdf?index=trueIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_0f48bd26489c41b6b931cfd477fc9941.pdf?index=trueIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_94e1cfeb8c9f46af92facf951f355c3c.pdf?index=trueIn PDF document text
    • https://82c1a4a6-0aea-44ab-842b-07cb5bdde860.filesusr.com/ugd/aafee9_9989136aa5f54ec4bfe964ef03ce7a6e.pdf?index=trueIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_2f33249f8b234129852e7d831802f591.pdf?index=trueIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_1aa8995daac343aaae5b120f4687788c.pdf?index=trueIn PDF document text
    • http://memepev.myartsonline.com/tuwuroponuwidesu.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/46944390502.pdfIn PDF document text
    • http://xasagode.myartsonline.com/what_are_the_different_levels_of_iphones.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/50524991737.pdfIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_b766ba795c83442a91eb191996bfd2f2.pdf?index=trueIn 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_off00012061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12061 5048 bytes
SHA-256: 48a4c36cfd857bd05a18930f09e22a9bd8c2d7aa9f43c1d63adc598505e83b96
font_01_sfnt_off00013191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13191 11908 bytes
SHA-256: 2eb4eeb8fddc56a6a6bf736df1167d7d6b39d5fee226c26f0118ef5c69af8007