Malicious PDF — malware analysis report

Static analysis result for SHA-256 341b76d837cad543…

MALICIOUS

PDF

73.9 KB Created: 2021-03-22 14:45:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1b7f89d3de8a331fe666830f447ec8ca SHA-1: cf2f1a38ba049bac0e91b65239e4ed00a1aafe97 SHA-256: 341b76d837cad543f151d0bc2aefbd791b9f1efdaa8c53cd2d3d34115645d783
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://leonvi.ru/123?utm_term=kanchana+3+background+music++tamil PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377662/normal_604b70284ef74.pdfIn PDF document text
    • http://cheapestshop.xyz/marques_de_sade_biografiaky8u8.pdfIn PDF document text
    • http://ergors.space/how_to_fix_a_fix_it_ticket_in_californiahz0fm.pdfIn PDF document text
    • http://dkblogin-de.best/44806370986zpadj.pdfIn PDF document text
    • http://blognews.top/what_is_black_ice_slang_for00frl.pdfIn PDF document text
    • http://hayatevesigar.online/nadajibap23c.pdfIn PDF document text
    • http://zinuginevero.22web.org/centurylink_email_setup_on_android.pdfIn PDF document text
    • http://vukuwupevipe.iblogger.org/temugakisivekutuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494888/normal_604117fb82e8c.pdfIn PDF document text
    • http://uscreditcheck.info/60379894344vwjvu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fatofejeripise.rf.gd/catalogo_sandvik_coromant.pdfIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_29115bb8abd844088a547ba1e31506b7.pdf?index=trueIn PDF document text
    • http://sewesomepajava.epizy.com/death_by_a_thousand_meetings.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_d4937949ef4043298185405f53a21f31.pdf?index=trueIn PDF document text
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_9152af5e8e864617b306658dae5973c9.pdf?index=trueIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_e4e7ea1fe3774ced9a4b3bd67cfd859d.pdf?index=trueIn PDF document text
    • http://sokatesexoli.epizy.com/zofosanuberikutuwi.pdfIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_24c25b82719640c1a06007e0b0ba65b6.pdf?index=trueIn PDF document text
    • http://pubamuv.epizy.com/kovimonuxikumasopusubujov.pdfIn PDF document text
    • http://novegiw.rf.gd/marksheet_of_ias_topper_tina_dabi.pdfIn PDF document text
    • http://jexeworepo.epizy.com/hello_ham_santosh_betiya_video_song.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000d3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B1 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off0000e498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE498 5692 bytes
SHA-256: 08f8dfb68fd910e651b7b04b117120c0ac955ab4144710a6ac09b7868db92425
font_02_sfnt_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 10016 bytes
SHA-256: 928d7d3ae55fbed24ac80ed2103c513c57f603bc3fd89b4b9f50417133169bf2

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