Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef385464a3d5351…

MALICIOUS

PDF

76.4 KB Created: 2021-04-01 06:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4f3fc3abd56777274f69826772d5b489 SHA-1: dd40ad3998922b10ac17b986a2b9ec9cd734fe34 SHA-256: cef385464a3d5351536a3d859eefdb53d934b16fb16acbba8c09ad11432a9b04
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 0.9997

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://jumiwimov.ru/123?utm_term=yaari+avneet+kaur+song+ming PDF link annotation
    • https://kirobobu.weebly.com/uploads/1/3/4/5/134593563/nawoxosezeb-resejivame-gakebopemotol.pdfIn PDF document text
    • https://cdn.sqhk.co/dokederajo/gjazH43/31401851694.pdfIn PDF document text
    • https://cdn.sqhk.co/sebidurubuze/9CzicWR/snowball_fight._io_miniclip.pdfIn PDF document text
    • https://vipavogezeguw.weebly.com/uploads/1/3/1/0/131069860/3588201.pdfIn PDF document text
    • https://cdn.sqhk.co/xapewiwud/gicW3ha/nusefofenisutapemoso.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/ejihehi/62961432214.pdfIn PDF document text
    • https://duzigavejad.weebly.com/uploads/1/3/4/5/134513143/4521301.pdfIn PDF document text
    • https://bogizironafek.weebly.com/uploads/1/3/1/4/131406395/3964f5b.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/dlhcjbS/lijozetezoge.pdfIn PDF document text
    • https://cdn.sqhk.co/bamewimoxatu/tjcSjjn/82073052652.pdfIn PDF document text
    • https://dubibezu.weebly.com/uploads/1/3/1/4/131453247/sumekaxa.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/ejcgcie/ski_jumping_live_stream_bischofshofen.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://s3.amazonaws.com/debiwelof/85249287422.pdfIn PDF document text
    • http://bumobufunuveli.rf.gd/92519425671.pdfIn PDF document text
    • http://mipetilivanuf.epizy.com/cebuano_bible_maayong_balita.pdfIn PDF document text
    • http://merawaboz.epizy.com/35675984530.pdfIn PDF document text
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_03925cd0df3343f0ad9ea38b77b38101.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/dokelejalupupit.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_6800d6094e5240e2bf083000a302a9c3.pdf?index=trueIn PDF document text
    • http://xexerekiw.rf.gd/31187778436.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 4940 bytes
SHA-256: 9971d8b0746101c2205c5ce33ff1a5817bbc60ab3e7b8100face9a1831a7bbc7
font_01_sfnt_off0000ef23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 11580 bytes
SHA-256: b2cb749e6cb1161262f359d5f8a173e7cf92a85d599d6aef558324f25ce3f076
font_02_sfnt_off00011690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11690 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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