Malicious PDF — malware analysis report

Static analysis result for SHA-256 37449556e9480db5…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 06:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: abbbb4bbd8c3b5e3450707b4c07382ab SHA-1: 8dfc4d9e39734f353a09248ba02c12c08d93b13b SHA-256: 37449556e9480db59ddbb8655a341dea322532ff4f06c55cedb4d1183e608a0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or redirection scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://atletika-pardubice.cz/files/file/64461359084.pdf In PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/lotufeladoreketijipowired.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/14111977939.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/fidokuziw.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/57222584670.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/soxedasale.pdfIn PDF document text
    • http://sun-tes.ru/files/file/punufetekuwodurodak.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/1977466936.pdfIn PDF document text
    • http://sasalidayanisma.org/uploads/file/436040624.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/21090516591582304866xkj.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/saliporefoju.pdfIn PDF document text
    • http://okun.su/upload/file/78169028323.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202194457257737.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/gebonuzokurabotovijawefol.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/dosup.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/39222354405.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/94177726158.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5uj1rauhtop96r87bue6fulgn5/ralixivakidivez.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/mumazarolinudupigoj.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/45069493744.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/wimitijuwojiteda.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/9514586024.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/44159922946.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/darexevafanojenivulek.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/3294348615.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/jibaforigasigowaseve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sapiens+ebook+pdfPDF 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_off0000dad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD1 10556 bytes
SHA-256: 961ab1ad70e9ab086edc8c332ada6307a5d1ff70232b618d7f2928d71b03c327
font_01_sfnt_off0000f2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 17956 bytes
SHA-256: 8f4cd7675e6116df2110a61ac3441fe5ff1ccb925bc8ce403fce41037ede5967
font_02_sfnt_off00012128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1