Malicious PDF — malware analysis report

Static analysis result for SHA-256 795b57f4c231540b…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 09:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1d5dce2ebdef0c57723b074add7287ea SHA-1: ab668eccb289f24bea5a6f98d9400e4f639596c9 SHA-256: 795b57f4c231540ba15f96e364712c50c8a58513325af957992fb84b3ff3684e
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious content, likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://yuanyoujie.vip/userfiles/file/debewanarilesibozij.pdf In PDF document text
    • https://etonbio.com/newsLetters/images/file/puzogademonimosediseze.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/kuvelirupar.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/18327636267.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/toteriwokamubojizil.pdfIn PDF document text
    • http://azizolace.cz/images/file/28406484653.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/paravomofolivatevutuzosi.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/mowofuxi.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/motonazovumosuv.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/92774683691.pdfIn PDF document text
    • https://krossi.ru/images/content/files/nizovepatajologopig.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/82528294573.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/55992084476.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/32431620803.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/sideworoxove.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/musurasubak.pdfIn PDF document text
    • https://magic-ray.shop/uploads/files/tibedu.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/vomozonuwunibef.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/10535538618.pdfIn PDF document text
    • https://ip-pharma.net/data/files/xiwuzoruledil.pdfIn PDF document text
    • https://razredna-nastava.net/files/4986191548.pdfIn PDF document text
    • http://boldogelet.hu/media/81690573969.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/fakosifuboronafe.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/lomozap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=home+workout+app+mod+apkPDF 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_off0000b168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97F 10412 bytes
SHA-256: da0565138b758df65113fcb22f712d2c65942487f7a6bb167c83dcd7442e0f5b
font_02_sfnt_off0000e11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11E 17216 bytes
SHA-256: e93cc31f95a57e385be68ce6994ae0eb6c07d8cdaec76ed1ece1d3d796c8a032

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