Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0d7622da66faa5…

MALICIOUS

PDF

74.7 KB Created: 2021-11-11 23:42:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2ecbc2e6e116b867b526ec152d547306 SHA-1: c8b66ba939f3b98fbe365f7868787f5696975c88 SHA-256: ef0d7622da66faa502634102adfc2cd9708d46344a0cd2344df2e58f2bdda8bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. It contains numerous embedded URLs pointing to external sites, with one heuristic specifically identifying it as a link farm on disposable hosting. The PDF structure and embedded content suggest an attempt to redirect users to potentially malicious websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://self119.net/upload/userfiles/2021/09/files/210922040542.pdf In PDF document text
    • http://mgtuae.com/uploads/file/jekapawawagisi.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/68231381876.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/faxatuwawunopuwobufudexil.pdfIn PDF document text
    • http://industrialdevices.in/uploads/fobibidasudi.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/kapaner.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/91158054226.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/87872664149.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/32691777492.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/koxexebatejojefebijonemup.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/6966451238.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/37698528347.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/bopowo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/9edd99cdbcee96fd89f7bd6d1ba282ab/sabukilurobosexalulire.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/xisokogemekekonujotitajun.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/84577464868.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/tuwaloguzirojuxafe.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/6177938109.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/81766399147.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/62253286822.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/37865918421.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebf681f51a---75437642632.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/28381305346.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/tasenogezuwemujemaw.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202110072300541217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/TSvcnjQ06Jg/uplcv?utm_term=good+boy+quotes+for+instagramPDF 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_off0000bfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEC 17060 bytes
SHA-256: 68aef4655151479ae483b17446b4db38a418d777a87f8a07e372cf5f72ae5fed
font_01_sfnt_off0000ec54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_02_sfnt_off0001037a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037A 11188 bytes
SHA-256: 9a613015adf9b57b43c600ffd7049fc0db96adea5201ba9edc7eb21cbe3e9efb