Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b84a4b18615324a…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 06:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dc3112f957d86a97daa176027e45c157 SHA-1: a5800d739e5222c9203343b5eeddbde106501236 SHA-256: 3b84a4b18615324ad2cfa0fa831da6a946bf87cefdc9ab08a6033a1a2a9b318a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, which is a common tactic for phishing or distributing further malware. The PDF structure and embedded URIs suggest it is designed to exploit users by redirecting them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=oil+reserves+by+country+2019 PDF link annotation
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a573e4fc0ff4c2e4a68c3396813fbdc4/pimizito.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/kakotadarufipabodifanu.pdfIn PDF document text
    • https://iohrp.org/f_files/files/lapovonanawakizugedega.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/butiriziloragudafodoxi.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/sanawivow.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/guvotuza.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/2992832490.pdfIn PDF document text
    • https://uangraja.com/contents/files/gexogunekuxanez.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/repajapaxixafesilan.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/tewoduluf.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/panivubupelixafemiwar.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/pitemas.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/95534069761.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/razajumulaseli.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/55997454456.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/sisomifuzoluseni.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/58003298589.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/38981983573.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/fabikijugugavi.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/nodujojaneguz.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/19685110166.pdfIn PDF document text
    • http://pactolous.hu/upload/file/vaniwenifaranaba.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/rilunuporaf.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_off0000e51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 17500 bytes
SHA-256: 6e21aabc9ba572765df01aa9ec36c18d7ec77e70b2a996acdd53d6e401eb1d56
font_01_sfnt_off000112be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD5 10968 bytes
SHA-256: c90c702a4c51c4e7ca9bf164ca2a7b9b3c05edb331161f6e91ff6ed0fa01fc90

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