Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f543b9394842f77…

MALICIOUS

PDF

81.6 KB Created: 2021-03-04 21:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 682e28896b3c9436213c30f318f0a42e SHA-1: 84bcd1364a21fa138df4f6211a4a83dfb62a05b0 SHA-256: 7f543b9394842f7780d2f85f124208db114c60bd23479352c5504af9369681b2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://gimoguvi.ru/strik?utm_term=very+short+stories+in+english+with+moral+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368466/normal_603782c5c52c6.pdfIn PDF document text
    • http://kosolibanun.iblogger.org/hooked_on_a_feeling_drum_sheet_music.pdfIn PDF document text
    • http://jetelijunejuk.iblogger.org/40525180355.pdfIn PDF document text
    • https://gepogixuzusesil.weebly.com/uploads/1/3/3/9/133999736/574d6fab0e249d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370090/normal_5fc7b58c79ebd.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/hp_envy_4500_printer_cartridge_problem.pdfIn PDF document text
    • https://birivisixakaxe.weebly.com/uploads/1/3/4/6/134608058/romapux_kebijexe.pdfIn PDF document text
    • http://sabovibin.medianewsonline.com/91383119624.pdfIn PDF document text
    • https://nezejigon.weebly.com/uploads/1/3/4/6/134611081/7398588.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/a8c11b23-8731-4792-81aa-367369ea1c58/a_documentary_history_of_the_united_states_expanded_and_tenth_updated_edition.pdfIn PDF document text
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_d8f96c10302c4470953fa9c7a615c398.pdf?index=trueIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_5ea224be81a1495f80cf2667014f6ad1.pdf?index=trueIn PDF document text
    • http://nupopejif.epizy.com/can_i_make_popcorn_in_my_ninja_air_fryer.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/mvcc_financial_aid_email.pdfIn PDF document text
    • http://xelemebimatof.epizy.com/m_audio_axiom_air_49_power_supply.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_6b98493312ba4dc6b593af84710a6ac8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a3935df-f6cd-4d7f-93b2-41e9548861c9/74866356785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab9787d-2523-4e9c-b76c-11c332825e0d/xegebexepe.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_off00010120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10120 5616 bytes
SHA-256: d49fdae39fa5cd6d8510a6e74a53854f65c5584a02691c8c4045d41bd49fac84
font_01_sfnt_off0001142f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142F 10768 bytes
SHA-256: 0c724972eb78b52caedc158011ba783934d52443f4999e4734744567c0f22358