Malicious PDF — malware analysis report

Static analysis result for SHA-256 e476d4d59edcdb53…

MALICIOUS

PDF

83.2 KB Created: 2021-03-30 09:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 83bd1d121db887ce8095a8d9de775761 SHA-1: 7041f2d3c40ced2a8df0294e1c47d8c67c186ecd SHA-256: e476d4d59edcdb53e338f1d0d2b92bd38cb303ca9a199f18c4f893e0ff981c96
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9994

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://crophysi.ru/123?utm_term=academic+word+list+for+toefl+ibt+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4443799/normal_5ff35aed2b40d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370097/normal_5fca69e27f727.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/vFqXgdy/64279102459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_602b2d97a3b42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475565/normal_5fd785aea9dd1.pdfIn PDF document text
    • https://cdn.sqhk.co/wukorovev/iheNmje/25870278465.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365540/normal_5fccb0b59a25f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_7b25b61cab164c69907ffc5b8b6b0997.pdf?index=trueIn PDF document text
    • http://sujobej.epizy.com/whole_body_stretching_routine.pdfIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_88b218f4eb9a467086f7bae40e7a66cc.pdf?index=trueIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_92cd2b4d8e4a444cb17fdafec288fdc8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezorito/maan_abhiman_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f04370e1-4b83-443b-aed5-dbc716f0ab44/how_do_i_reset_my_apple_airport_express_a1392.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/alberta_blue_cross_dental_claim_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a17b8581-d962-4ad6-a91a-dfd2871601ea/serurotu.pdfIn PDF document text
    • https://11e0ccb5-01dd-4757-ae93-f6f3b4f5ca32.filesusr.com/ugd/1a2ce6_b09cc57894ed4c63baf61ebc2e7a84ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/02aa40b4-b21d-45e8-af9e-c000fc6e27b4/galaxy_a10e_price_unlocked.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/annual_leave_form_tsc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06bc06aa-87ff-4ded-8c38-314c1c0f2b90/what_is_the_top_200_drug_list.pdfIn PDF document text
    • http://jibomivuren.epizy.com/foods_to_avoid_on_keto.pdfIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_c022b7e86d524248a5be72752853c749.pdf?index=trueIn PDF document text
    • http://tedivepi.epizy.com/kenawaxazusivonuvadijero.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/89830772223.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_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 5520 bytes
SHA-256: d38ea0ce5cef18f5c1b9632447737cb829065c481780f997160e1d8839e5745b
font_01_sfnt_off00011996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11996 11264 bytes
SHA-256: cad90bd68b1e6cabe27e9f40ae5e7016789536be119f103506d5cefc6ba0b734

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