Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c59dbca78c1fc3…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 16:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d5e41b84eebaa129ff52fde5afca7a2 SHA-1: 46da9ff3d16b19fc82a76c57715b4d7fcd9fb064 SHA-256: 75c59dbca78c1fc3607a5e8f02900d1d962905a7cb311fef11d953c6e16c46f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, suggesting an attempt to direct users to external malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to lead users to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://ztracenaexistence.cz/files/content/file/7899190507.pdf In PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/tunis.pdfIn PDF document text
    • https://podimercrm.com/img/files/topivagigifilagerodipiku.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/96718132347.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/74362091271.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/858df9e139a1eda141723e36dd11c8d5/71422423029.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/6138402679.pdfIn PDF document text
    • http://yuha.be/_files/file/zerafikamasevuwivaruzil.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/velevurasanogezisujiger.pdfIn PDF document text
    • http://vitccorp.com/uploads/userfiles/file/tozafuxoxe.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/62667111851.pdfIn PDF document text
    • http://skisun.it/userfiles/files/jidufetemigelawet.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/7240834752.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/61659407466.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/26662972936.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/sakixoxejutumegonikofopif.pdfIn PDF document text
    • http://terrietanaka.com/library/files/porenod.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/vovojigubemelatapijo.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/92569263911.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/nisanabovi.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/pomujidamelaxawa.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/82581753053.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/91016154138.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/58587348923.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/komixexopumu.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/2196178233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=burnout+paradise+android+apk+downloadPDF 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_off0000b4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCF 15528 bytes
SHA-256: ea0133fe9cf9be826991f04165e82ff59748252c1721ea90e5e3a68fd34e83a8
font_02_sfnt_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 10716 bytes
SHA-256: d74c6788705169a3fac91370bafeeb2b15b711a172621da56fc83ea0ff7b82f1