Malicious PDF — malware analysis report

Static analysis result for SHA-256 5369fc5dcf33bdd4…

MALICIOUS

PDF

70.1 KB Created: 2021-03-18 06:22:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 904e44ab1ff611ec6fe6faaaac15c604 SHA-1: dc1a7c23971610e177ffaa2ba2ce145bc6b586f8 SHA-256: 5369fc5dcf33bdd44b5215f6e4a1ed96b6b236029e554c5b489229d192b0d776
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/wix?keyword=hotel+front+office+training+manual+sudhir+andrews+pdf PDF link annotation
    • https://negogesi.weebly.com/uploads/1/3/0/7/130739616/topenanu-finin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_60511adf907cd.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/jejudos.pdfIn PDF document text
    • https://vemosesagegedow.weebly.com/uploads/1/3/4/3/134312783/6195121.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/zetafofala-kesomujonolonev-wozugijow-betixuvuvot.pdfIn PDF document text
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/buzabowamum-libeweronob.pdfIn PDF document text
    • http://firstflirts.site/50155839283523qp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450506/normal_60276b226f5d4.pdfIn PDF document text
    • http://afracheat4.xyz/vezodenizubapigk4r03.pdfIn PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/jixujuzeza_fuwutavev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415527/normal_60016f6d7c5c2.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/dPhdjhX/pinball_prison_escape_classic_cops_n_robbers_3ds.pdfIn PDF document text
    • http://toppiksnack.xyz/why_wont_my_galaxy_s5_turn_onoj619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412164/normal_60179efb6ee1d.pdfIn PDF document text
    • http://on-arenas.com/sophocles_oedipus_the_king_downloadkae3i.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/iejeHgj/earthlink_wifi_internet.pdfIn PDF document text
    • https://cdn.sqhk.co/lusoxepero/hKFBkcQ/business_insider_tesla_stock_price.pdfIn PDF document text
    • http://reduslimitalia.site/bls_student_manual_20152ch1j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b962c29b-1a16-4d97-a630-68bfda4e66eb.filesusr.com/ugd/3e0cb9_eaf62b4902004856aa53785eda2b663b.pdf?index=trueIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_2f70ef408e874b9e94bbd2747ab8019c.pdf?index=trueIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_21ee39e957814bc78dc3848e24c21bdf.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_off0000d372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD372 5624 bytes
SHA-256: 4414f29b4b8e28a204e156086f9cc73c4f2b3d11c961b541845577ce7d3c0ed8
font_01_sfnt_off0000e67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 10536 bytes
SHA-256: 3c1c555d0e6006f3fad82eee6c005810b72c700088b3dfcbe588e4796b77fc20

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