Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8116f7baa4e7c2…

MALICIOUS

PDF

89.9 KB Created: 2021-03-28 07:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: be9aefe252eb0f84faebff57b487e097 SHA-1: 0575fa9af08d5de7698523545341821ec250e223 SHA-256: ba8116f7baa4e7c254ea290165a41dd83706882b689f9caadcd9eea4c299c5bc
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary external URL observed is https://zajinet.ru/wix?keyword=scag+cheetah+repair+manual, which likely serves as a lure for users searching for specific repair information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=scag+cheetah+repair+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384150/normal_6018d0e4a4a53.pdfIn PDF document text
    • http://nutusugeralinet.mypressonline.com/2097777070.pdfIn PDF document text
    • http://totalcreditcheck.info/mejor_curso_de_ingles_online_gratis_20197u1zr.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/pibixezivowofosases.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410441/normal_601fafa36a71b.pdfIn PDF document text
    • http://davebamonuzove.medianewsonline.com/the_book_thief_summary_part_1.pdfIn PDF document text
    • http://cz-nitrof.website/libro_caballo_de_troya_1_preciokw4pr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384655/normal_601a9b47d6af6.pdfIn PDF document text
    • http://jirenaxapibetig.scienceontheweb.net/how_to_tell_if_wood_stove_is_epa_certified.pdfIn PDF document text
    • http://samettemiz.xyz/free_printable_gingerbread_man_story_characters_printable1smoq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498366/normal_5fe401f342585.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_176b6aab0350431a8ddf6bb711f6013c.pdf?index=trueIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_9863ab606e34495d9d59fe131ca085fc.pdf?index=trueIn PDF document text
    • https://7893bdd6-41e4-48f6-9953-3a636dfb5d61.filesusr.com/ugd/c5c63b_7c21a3b8b5c84fb6be1f529c16085a40.pdf?index=trueIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_a4177b01ddae4e6b98ebba7b7e29832c.pdf?index=trueIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/dufozoxotevavipif.pdfIn PDF document text
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_1d5752b468a24c87b166dd7a39d2f999.pdf?index=trueIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_ee32b967419448dab439d47ccb0384c8.pdf?index=trueIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_61a8370e6039432fa71231d625663aa9.pdf?index=trueIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_e52a4bb437ae4365b195cfaf12d0c59b.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_off00012011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12011 5272 bytes
SHA-256: ac5c8e8ae887b60f8d375f0ec63527b8c741a611252e03e2efcb18a34aa5c16e
font_01_sfnt_off000131d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D7 12048 bytes
SHA-256: 3a4fe3fddeca5543e61e7846fcde1db6604383aa360d4059c1331d2294bcd370