Malicious PDF — malware analysis report

Static analysis result for SHA-256 c166b2b41a22ca6e…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 13:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 061f7790fdbdab5f3274c2ad8b2e2115 SHA-1: 8722b02980addcca8456737106cd76a759ce0358 SHA-256: c166b2b41a22ca6ec012707eff57b7d1ab9126f4d4b7e5af94548a62eed61962
134 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, with one heuristic identifying it as a link farm designed to trick users into downloading a file. The presence of a 'download button' heuristic further supports this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134504bc91dd---39034227528.pdf In PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/xesudidasonagujapomakuzib.pdfIn PDF document text
    • http://mfcpavpos.ru/file/71261589757.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/jaxevenizafasidupepu.pdfIn PDF document text
    • http://zgic.ru/!upload/files/49091530627.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/35690008019.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/56675035779.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/zunulekezakovudixaw.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/92838617536.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/lojuwonedonexif.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/25291325780.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/81161848689.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/nezarozejenurewupenoraso.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/61479929503.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/38771247254.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/14803157676.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/81961199115.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/12588357863.pdfIn PDF document text
    • http://citranco.com/users/files/31431502157.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/97104466923.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/76488353781.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/koziraredotedimofapal.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/gujedivopubutisuba.pdfIn PDF document text
    • https://agros.net/uploads/file/53428825071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=bikini+drive+in+movie+onlinePDF 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_off0000e8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 17548 bytes
SHA-256: e6b5975a47ae368a5f1cd0b5ae08d111795cfd876ede373a67f27f984d90b352
font_01_sfnt_off00011670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E87 10192 bytes
SHA-256: b3696f94f1957f31b9f1c6e16932a753f054cd4529892d6185ae25eecc624d29