Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77651ae0c0a39e4…

MALICIOUS

PDF

68.3 KB Created: 2021-09-20 00:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a4272e6e176cfe4d8ecdd9e342f67eb SHA-1: 93290c742e2d063e9fff733f72e58f6ebfae5ca7 SHA-256: e77651ae0c0a39e4af6f3fe8c25f514e7c8875d09aa55b156b5cbaecc2fce905
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the presence of embedded URLs points to an attempt to lead users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=manny+pacquiao+real+boxing+mod+apk PDF link annotation
    • http://mos-craciun-inchiriere.ro/fckfiles/file/92254978047.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/jopefe.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/54491323597.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/4275175864.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/76865356295.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/lupimowe.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/rominumabulafavinepibev.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/zonumos.pdfIn PDF document text
    • http://wernitznigg.at/files/16614196473.pdfIn PDF document text
    • https://priscar.com/documents/files/lijidupizomotiporabaditag.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/72857183146.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/92039395004.pdfIn PDF document text
    • https://robertbah.si/files/file/gajekebanonapon.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/kugujirinepi.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/jevixokunilunok.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/mosavewujomiw.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/kilusonunuvijariwofuforo.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210905_100458.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/91704536289.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/gekinodoze.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/bofekunadawigow.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613702c9c53d2---38937601340.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/51590901076.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_off0000ad67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD67 11276 bytes
SHA-256: 438d49d8a26efe842b3a19bef306e71d967d45e6a0bac09f0803e38990bfefb9
font_01_sfnt_off0000c722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 14668 bytes
SHA-256: 7dce853c4dd02b56e80880576cb02c8f9c3ea401ec17d7fdc30e4c6e1617b410

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