Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ca88324ad1a326…

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 15:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5d3c05d603f1cf18852f0bf9a63eb671 SHA-1: 1620939c0cdda7827eacbfa5f74416ac0912bd94 SHA-256: 27ca88324ad1a3260777ee68a2575747c65c6cf7154305b0a6d25824101580cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links hosted on various domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing attempt to lure users to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://fortworthdental.net/cmsCart/upload/file/vakumo.pdf In PDF document text
    • http://ippinnudon.com/uploads/files/89812467355.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/1305805726.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/tokurekokizuj.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/xakugozuwimoratowipi.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/gavedasovekirilak.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/bivazel.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/sidupedasafilovam.pdfIn PDF document text
    • http://altus.pl/userfiles/file/paxudexitaba.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/suruxawulowefude.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613665897c23e---vogewinatebigamu.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/tubokorijesusujukobuk.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/menaji.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/92940060543.pdfIn PDF document text
    • https://umartravel.com/files/42141754588.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/xafazutu.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/qv515mb4u9u3ueqk9fcqtvun6o/mowadupagudimi.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/39407097339.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/pudaloxusizoji.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/1721070330.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/funijogaxusudoris.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=get+popcorn+time+apkPDF 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_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 10452 bytes
SHA-256: d725b953fc961c2b2dc5c2e3d85f15467a22a0830b211e78ab7f42e04b80b7f2
font_01_sfnt_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 17704 bytes
SHA-256: 23ca705611af5faee3be49a2c54ee8e755196923a6a1394d3380416591d29cf1
font_02_sfnt_off00011a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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