Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb7e749901d27a0…

MALICIOUS

PDF

80.1 KB Created: 2021-09-14 05:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 6a2eedd647abdc69fc69103527f6e032 SHA-1: 676ea539eaac219c840b9edc2d3596d53aed0a1c SHA-256: 5bb7e749901d27a070d5204389e482b29d521acac73723709702699fb611d6c2
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. It contains numerous external URIs, suggesting it functions as a link farm or a lure to download further malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=nos+veremos+en+la+cumbre+pdf+download PDF link annotation
    • http://flyingkirin.com/uploadfiles/file/120558344731.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/devodituvenuxitezat.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/98962592702.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/34954473674.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/dovijozemaxivekinaba.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/bujupufakibunivudizem.pdfIn PDF document text
    • http://findusafranchise.com/files/files/27965334051.pdfIn PDF document text
    • https://ptogel2.com/contents/files/siledake.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/tuxom.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/dixomexifapewaniretixod.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/4070915585.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/33566583159.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f902e38fcb---26203149165.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/80675036279.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/lalezisatasuzepew.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/midesefezemusanaxibuxilad.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff9e5cceaf---46763562313.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/30763502858.pdfIn PDF document text
    • http://ombs.ru/uploads/files/78478539300.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/10589167766.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/wezovedixezakajodofek.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/gurusapive.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/kiwiv.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/93527769165.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_off0000c960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC960 21264 bytes
SHA-256: b7834a085599e7e6d41f2d89c5792be9603712cf757d2a39756d96a969333b8f
font_01_sfnt_off00010109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 10960 bytes
SHA-256: c005aec063b2915e90284451de5c8ded174a590d637c303eae35b311cc971567
font_02_sfnt_off00011a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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