Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4198315a1d2699…

MALICIOUS

PDF

68.9 KB Created: 2021-10-01 05:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 137e46d7fab979195695420c8c3509fb SHA-1: 20ad7b166a4983a964ccf56b6f5c347f75169528 SHA-256: bf4198315a1d26995eceb20c06855842157caf7a7aa2b351e407373d5e495ea4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains numerous URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a non-clustered link farm on disposable hosting, and the presence of external URIs further supports this. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=sing+play+karaoke+your+mp3+app+download PDF link annotation
    • http://atel-j.nl/uploads/files/titisiloverikigilipor.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/mesosuj.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/24043591089.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/derimanevasaju.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/tufajuxa.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/lakeso.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/38214042897.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/rulibusisoj.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/92232492075.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0b0360b30ed09f1bf8b6dbf2709db050/3051023476.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/degatimibugigemuluxo.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/nubabofa.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/4447764570.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/60985131126.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/luminukezibotagirilasitu.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/jotuxut.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/39414663140.pdfIn PDF document text
    • https://vanha.kokkolansuunnistajat.fi/ckfinder/userfiles/files/19905214391.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/wuvasejinawasok.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/adc04eca3de5eee3d6783ab832121c70/65620674711.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/63289001682.pdfIn PDF document text
    • https://hoavily.com/uploads/files/68435470289.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://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_off0000abd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E2 15372 bytes
SHA-256: 4f31c8e62deba3ba861b9b5dbf33b2b02e59d35d01504218b6aa77003a71e1da
font_02_sfnt_off0000eaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 11108 bytes
SHA-256: 2d593b801b99cf36ace762ce5be4a17c49a1c5064490e42ef36a8d67c05d4453

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