Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26e3c5768d50e5d…

MALICIOUS

PDF

74.7 KB Created: 2021-03-18 08:10:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 76d743b0edb963fca937778ac1dec77d SHA-1: 586ec0c8123128472860fbff4a26455ec1ae7d02 SHA-256: a26e3c5768d50e5dfc46f31ab6ab3e4ebf546e130027b06470d0dd4ea05f37e2
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 0.9996

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://zajinet.ru/award?keyword=thomas+calculus+matematik+1+t%25C3%25BCrk%25C3%25A7e+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404285/normal_5ffb3d885647e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416321/normal_6000034598426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380692/normal_601d2a6b59869.pdfIn PDF document text
    • https://cdn.sqhk.co/gulaxemetila/jarjfig/merchant_processing_services_definition.pdfIn PDF document text
    • http://fuworolimew.22web.org/hakko_fx-888d_change_tip.pdfIn PDF document text
    • http://remumajisipiv.66ghz.com/zupiganaxirosorudaje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402000/normal_600f9ff5cbe6c.pdfIn PDF document text
    • https://wavurujubatebar.weebly.com/uploads/1/3/2/6/132682053/bikix.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/dGM5LB1/digital_camera_rechargeable_battery.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404755/normal_604d1cc3554f5.pdfIn PDF document text
    • https://cdn.sqhk.co/dilobowuz/hfihgdI/55787783019.pdfIn PDF document text
    • https://zaduguwage.weebly.com/uploads/1/3/0/8/130874015/2175104.pdfIn PDF document text
    • https://kisuvali.weebly.com/uploads/1/3/1/1/131163683/5825950.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/hjiiLge/linamijunelitaxal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530171/normal_6044f3a7e331f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487007/normal_5fedbdf9663a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tekunobujolid.epizy.com/bell_bottom_kannada_new_movie.pdfIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_860b1d76b2e247b493e05d27ec3a5e77.pdf?index=trueIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_a9207db3a5544ffd990ec6c9f627d97b.pdf?index=trueIn PDF document text
    • http://mewozukejos.rf.gd/catholic_calendar_of_saints_and_feast_days.pdfIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_66abbb72f89f422fbe40104efdabfc1c.pdf?index=trueIn PDF document text
    • https://f9cb7010-568c-45d0-b0a5-7bd630b60272.filesusr.com/ugd/b10ea2_3cf81d2c30f749a1b6af34e573c661d7.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_off0000e25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 5764 bytes
SHA-256: 02bf52e7f3682de53d34773a1427a6467958b94922f5efe1bd1e62f1377a657c
font_01_sfnt_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 12092 bytes
SHA-256: 863c4910379aaae2678530073eb17d5ea02161d103ebc60374ebc421f925eb99

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