Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdcc181c3e195255…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 12:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c11a263cf5aac8cd79564f2d61b5a54a SHA-1: 103f18c78520035ae38e87d077d6214c02daa76e SHA-256: bdcc181c3e1952554ef22a2a08d2a0373b8735250b036eaf32cc90ab72cf4a81
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • 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 https://pixomot.ru/uplcv?utm_term=how+to+mute+group+text+android PDF link annotation
    • http://velapower.com/glwh/UploadFile/file/2021090416154073499.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/12154718158.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/15498131003.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/pozutidipipapimupomumigev.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/47881012955.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/46800971657.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109101001288100.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613505afe03dd---77488631811.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/15662214963.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/99198873360.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/35020259312.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/57017766284.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/gupeperuwevopisafazaj.pdfIn PDF document text
    • https://almavilag.hu/files/files/98072430281.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/80087776313.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/dubavejogolukovuru.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/punukutapawawiwudiku.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/65355850254.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/77473023094.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/perepazavitiroxumido.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/rotowizoradirex.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/femuriwimuwafojibelem.pdfIn PDF document text
    • https://flammerouge.ch/userfiles/files/18796564831.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/zukexamomowobodipagilixe.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/newejipipuzurabibunaw.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/rilemumo.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_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 18048 bytes
SHA-256: e398afa08a4c0afb11c99c702d09f2d8042955eac2de6898e39e08e384148392
font_01_sfnt_off000105a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A9 10800 bytes
SHA-256: 94143a7ca0f4ba3938182a48b11ca60415ec36907b20fe2792f55cb6b0daa308
font_02_sfnt_off00011e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1