Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76807876f04f7b0…

MALICIOUS

PDF

71.9 KB Created: 2021-03-14 15:17:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 82e2e0e3c003285b4c275b4a399853e0 SHA-1: e74b163f147998a65ff1881aabee98f66f25886b SHA-256: a76807876f04f7b0f3e0b46edf2d09b2438d2622a051da166ae06d08218739ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://leonvi.ru/award?keyword=convert+t%25E1%25BB%25AB+%25E1%25BA%25A3nh+sang+pdf PDF link annotation
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/4151184.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426953/normal_5ff034b1bac43.pdfIn PDF document text
    • http://xapepinozex.22web.org/double_line_graph_sheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490547/normal_5fce7b8f172b1.pdfIn PDF document text
    • https://bisebisa.weebly.com/uploads/1/3/1/4/131406118/9150576.pdfIn PDF document text
    • https://fibigator.weebly.com/uploads/1/3/4/3/134313363/6300511.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/aha_guidelines_hypertension_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467287/normal_5fefedc924d51.pdfIn PDF document text
    • http://bajesiradevo.getenjoyment.net/spatial_analysis_book.pdfIn PDF document text
    • http://babitilakibo.mywebcommunity.org/75417871303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473056/normal_5fd8925ad12ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426418/normal_603cc6540dd75.pdfIn PDF document text
    • http://vetebozo.mypressonline.com/best_veronica_roth_books.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_604cc22d2b7c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fatisake/51670621593.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/72144102656.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/the_last_samurai_ujio_battle_cry.pdfIn PDF document text
    • http://zawidapiwixub.epizy.com/44078692204.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_off0000cf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8C 5660 bytes
SHA-256: eb7ad33163e18bb41433822bddf09dd06ce1682fd29eb0d9da1ee48eef1e4670
font_01_sfnt_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 20580 bytes
SHA-256: ef9d853e896b5a4b5f1fdbbf4554523e1b7eb2629632f8b4dee9b83a5f543102