Malicious PDF — malware analysis report

Static analysis result for SHA-256 358fc89c2c122d52…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 16:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5f8d9b15acd21c041d35fe4aeea43f1 SHA-1: c0976ae0f8dded7e2ed0278efe656a6327c4cd06 SHA-256: 358fc89c2c122d5203224800ae379e16921f3f10a1d64852559dbb83fcc3f58c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains a large number of external URIs, many pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination or host malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://dinskayarealty.ru/media/file/24357512081.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613113a4aca46---54122175163.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/15680050338.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-11/20210911171010993996.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/sakexupajiwuvavumigivi.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/43956364057.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/55113716148.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/wakazowodexurozupufe.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/kamofu.pdfIn PDF document text
    • http://industrialdevices.in/uploads/bipulukokajupil.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/86523986548.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/bitenunijoragime.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/11188554038.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/54363738294.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/95716300892.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/mipodigemu.pdfIn PDF document text
    • http://rayanchem.com/d/files/pazisepoxosexedodugo.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/lelosopekojiditadepixe.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/36317170397.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/buxasokof.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/90240358379.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/nibopopumifumewitatoruvu.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/9879390713.pdfIn PDF document text
    • http://runhouchem.com/upload/files/61823002609.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/0daea72d000499fcc2b8cce8dec9b02d/varefaleme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=intelligent+investor+free+book+downloadPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 17916 bytes
SHA-256: 0f15e2e3d5beed2495ca87b31811e540210db4e0fae75a154f929cce63d38550
font_01_sfnt_off00010fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F3 10864 bytes
SHA-256: 55aa9a150883213a20b4f08b8cb3114a7a0608cd616893f6b4142abfa10e2cf9