Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a22516f07bfd47…

MALICIOUS

PDF

85.6 KB Created: 2021-09-19 22:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 347267430cffe3203c9ae47ae633cf8c SHA-1: d11e49bddac0aa7c4fe730d7aa1ba368c69545e0 SHA-256: 41a22516f07bfd474dca28ac58105c62949ee626af56dd712c2e12c2b97c3000
126 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous external URLs, with the primary purpose of redirecting users to potentially malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://andlupa.com/userfiles/file/36136854037.pdf In PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161477bb61aab0---novilegid.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/gonumisedujavepunomele.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/35798109727.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/kojufipibamegonuruzener.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/6566067776.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/vugixajezavitixuzowe.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/luxuxolexekawigegowixul.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/zoropalemigekixud.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631589633.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210913061649.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/gufibatigutixon.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/rizuluwotozutidoz.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/pojalanazupazowugot.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/taruzozufoduwapefikofuti.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/duduxulapaj.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/sorifutudolenumudoribajur.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/95915480535.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/riselukoluwerakuwol.pdfIn PDF document text
    • http://neteyes.eu/editor_up/lezapakuvuxorafabamotuku.pdfIn PDF document text
    • http://cobmedia.hu/include/sojipojebu.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wuwan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=golf+it+for+androidPDF 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_off0000ee32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 10088 bytes
SHA-256: af8a711df42b1a52286db9280cf0d44aaae5739edb022421aef6a30c1d77aa24
font_01_sfnt_off000104bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 17000 bytes
SHA-256: ce9a6275e5a045db05d4036f418560fb857da2c121f25ec27696bec31e87d5c5

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