Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4b21d790509043…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 22:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b69f2ab34db6f7d0ea24bd3def0dfb4 SHA-1: c64f96e2c8e82a5fb95f57f66f20961e31f5398b SHA-256: 2a4b21d79050904386bd0d9e050cc090ced7be3ef386e635dd1258ca5d7285b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high likelihood of this document being used to direct users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pixomot.ru/uplcv?utm_term=android+video+player+project PDF link annotation
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/30722434603.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d59789e5f4ece119882efc1ea912779e/53232206423.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/burokurepapuzo.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/97852975693.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/63443691064.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/kepupukasedikilelugate.pdfIn PDF document text
    • http://weingut-suppan.at/files/gexivi.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/84046394180.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/fagujikikunojuxazimikabu.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/42040951578.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/pibubut.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/96512489573.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/fedusimedumipisevopokowo.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/potiwijunu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161314b79f35f4---lebekekokaz.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-11/2109110302337092050v69s38lv47l.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/49362282930.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/zujumu.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/gedorilurofefixorivuzuf.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/wivokepixuli.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/runilanomarolubamaferi.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/16368008067.pdfIn PDF document text
    • https://onlinendttraining.net/files/51838982923.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_off0000d97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97B 10628 bytes
SHA-256: 34234f800cc35b9b766ae0f8b291978cd7d4f69fd847034ac0a76ea6e2e4f265
font_01_sfnt_off0000f1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F8 17272 bytes
SHA-256: 10c39df3e41098d792385f1ec42290d0a53b7f80345286b9ded9f0d9bf11b6cd

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