Malicious PDF — malware analysis report

Static analysis result for SHA-256 961ce8550d836c54…

MALICIOUS

PDF

76.6 KB Created: 2021-09-21 23:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1218844a177ec7fec6c535537fe6e5e5 SHA-1: 9b0170e532639eeab69a1bfdcbb65d10fc15d421 SHA-256: 961ce8550d836c549b194745a3395cc1cf61c2a9d827a0b89f47ca7db6a227bc
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_REMOTE_SUPPORT_LURE' suggests the document attempts to trick the user into installing or interacting with remote support tools, a common phishing tactic. The numerous external URLs, including one with UTM parameters, point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://pistant.ru/uplcv?utm_term=bluetooth+para+tablet+android+download+gratis PDF link annotation
    • http://mmbc.cz/_data/user_files/file/kokumudibotulipunoravase.pdfIn PDF document text
    • http://soc-in.com/data/media/files/gezonet.pdfIn PDF document text
    • http://xn--299a941ap1h.com/userfiles/file/20210921225100.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/fodugolowurixe.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/61477164581.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xevewadeg.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/minoxodekolulimoruf.pdfIn PDF document text
    • http://baove24h.org/upload/files/wokivopagenugekipikufe.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/jolebiv.pdfIn PDF document text
    • https://geniodelweb.com/file/88607175398.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/febude.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/bopiwaku.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/koxiluregedojivenekeviv.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/91317749612.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95744326677.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/61670829382.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/zefovi.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/luzugi.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/48149898165.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/60855151814.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6bd051773---gixewinik.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/favowowewadubuf.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_off0000c915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC915 16468 bytes
SHA-256: 273641bdd47ffbaba25e6dd177f254a667ce3ca65c45fc40496043bc0b2b9e4f
font_01_sfnt_off0000f36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 11048 bytes
SHA-256: c9dd8859747053fab9edccd4dfb0147ccba3dc93958030461a34623df8ec6135
font_02_sfnt_off00010cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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