Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc87b16ecc65dc26…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 17:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f4b1ed895594628c78b4e4e8d47f60a6 SHA-1: 5da6570764f05fefc469ee935921dc030cfe1b19 SHA-256: cc87b16ecc65dc26679c6c66a7a2bad8ca4f4ac580c8ea77b4cc5265f6cc9503
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=free+robux+that+actually+works+2021 PDF link annotation
    • http://thucphamchucnangmy.vn/uploads/files/51778809640.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/98107664163.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rixefoditove.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/74042247613.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/bonudepuditimapuli.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/zobedizuxixi.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/xizopubixijexerinivivuro.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/91199611435.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/saxewuniwakul.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/wikurimexasu.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/piguzajapisovarixarirusiw.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/tadaxur.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/38396440867.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/14768002529.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tikepab.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/zunedotitunupe.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/fekalosiwefulibobidezi.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/jijexelef.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/10073978681.pdfIn PDF document text
    • https://vleek.com/uploads/files/mefin.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161353e9b4c25b---43094906820.pdfIn PDF document text
    • https://qkon.ca/images/file/bogilekeluba.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/rateruzezeverilorisiramo.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_off0000c3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 17616 bytes
SHA-256: 40f70fcaf01dc96eb6b321021ff4330ddb006009e436c70d07aa360b0cd567c8
font_02_sfnt_off00010964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10964 11036 bytes
SHA-256: 6c41e495c3a06cff96054383943d1974b09545b5e58146f4da0f8b290c3896c0

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