Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31839003b73c82f…

MALICIOUS

PDF

77.5 KB Created: 2021-04-05 09:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d7f59fa12acaf80545d3d1b551369e66 SHA-1: e25111cce4211e15670f3dbab6c877852c5cc682 SHA-256: b31839003b73c82f51bd5910c206068ee19317b0c39a5b2a6e7add01e17aab04
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 hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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://botokaw.ru/award?keyword=the+avengers+57+pdf PDF link annotation
    • https://tunajixawovu.weebly.com/uploads/1/3/0/8/130873758/a9e08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383138/normal_60025c9e77c60.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/platos_apology_of_socrates_an_interpretation_with_a_new_translation.pdfIn PDF document text
    • https://tikofasej.weebly.com/uploads/1/3/4/6/134615027/00ed8988.pdfIn PDF document text
    • https://vemosigexirapi.weebly.com/uploads/1/3/4/3/134387812/606489.pdfIn PDF document text
    • http://linunewilut.mywebcommunity.org/supply_chain_management_project_for_mba.pdfIn PDF document text
    • https://kovipokuvukos.weebly.com/uploads/1/3/4/4/134497495/420ce.pdfIn PDF document text
    • https://liletizotefos.weebly.com/uploads/1/3/4/2/134234842/8d163554d910d6.pdfIn PDF document text
    • https://wasavegod.weebly.com/uploads/1/3/4/5/134589575/nofidazaxewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422133/normal_5fe97eb35bacd.pdfIn PDF document text
    • https://vajipexinonadol.weebly.com/uploads/1/3/4/0/134096003/ab32f590215c.pdfIn PDF document text
    • http://nupesupo.mypressonline.com/90533240092.pdfIn PDF document text
    • https://vafevovelawa.weebly.com/uploads/1/3/1/4/131407112/8104844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467306/normal_606a2fa5ca13c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_6628755b6f134b9287ba6ca10365b5be.pdf?index=trueIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_004384f1b7c04f0884abd4ccd2b97af3.pdf?index=trueIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/how_to_program_a_radio_shack_pro_2052_scanner.pdfIn PDF document text
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_4b605a0c88234ac295b425424898a7ba.pdf?index=trueIn PDF document text
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_1b1f84e668d4427bb45096c7f2da7c18.pdf?index=trueIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_cd6ed0e1730b4bd8a05bac241223fb07.pdf?index=trueIn PDF document text
    • https://b0cee159-9ce3-47d2-9452-de9e383f1b6b.filesusr.com/ugd/fac5c7_6c8475a43789415b91c0a492ae138dc4.pdf?index=trueIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_b684527fc0ba4e3dabf0e7379ddc5701.pdf?index=trueIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_444959118e474c98b3fc52499272031b.pdf?index=trueIn PDF document text
    • https://73808e0e-d5df-4584-b63e-1552d949bc0c.filesusr.com/ugd/8d2ea6_a66af957a46a458f85a63750d81a5faf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 5036 bytes
SHA-256: aea7ccaec44940cea6584b03172d19ccff13695e4d0d30cfe4cc15efe7609b78
font_01_sfnt_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 11632 bytes
SHA-256: 448dced8f96fda37ab535988739184e0e88ffa08d51e249eeae72b7210fc947b
font_02_sfnt_off00011ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378