Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67c22b9f325cbf9…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 12:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8587ef35d166ea4734ee5264683c7f11 SHA-1: 80777dd23f5bae908359e17f8acc9db6a62a437c SHA-256: c67c22b9f325cbf9afcacac56b5630073681c315df034a79fdd47592772c44da
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, including one that appears to be a redirector with UTM parameters, suggesting a phishing or malware distribution lure. The PDF structure and embedded links point towards a tactic of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=live+wallpaper+pc+kimetsu+no+yaiba PDF link annotation
    • https://pgprojekt.pl/Upload/file/53080450550.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109182151156404.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/lajudusinof.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/71000378128.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/kubamituwozagifu.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/8296445769.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210902103114.pdfIn PDF document text
    • https://granitnet.hu/editor_up/gimawajovavumijonuwime.pdfIn PDF document text
    • http://c-six.it/userfiles/files/jituwomoliwi.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/sasosaxalozikule.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/kovegopubititalo.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/78113326013.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/30193983959.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f80b246f03d6cf680d73507e1e0f4dac/ginatasizijujagatiroxuted.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/wixuregodoxizozidesop.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/bopolinororewonosum.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcc387157e---45941837720.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109090308549197.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/47048714847.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/51159844046.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-04-07-22-02-43.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/kutajododogemefin.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210914140540.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/16497330620.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_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 18196 bytes
SHA-256: e21d231457a4e638dd893787f4c047c06b48395e8704243264b8267a99d68607
font_01_sfnt_off0001180b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180B 11088 bytes
SHA-256: c0b2514d1e15d0d5786f9d7ddcba595946b8a4d4a7772bc24de091bb97646dd3
font_02_sfnt_off000131cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1