Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d6cca756c059f0…

MALICIOUS

PDF

85.0 KB Created: 2021-09-16 06:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc3820e6e36630c72c0be2f04b93c7ef SHA-1: a75892cfa253f89bf151253c9de6979124511409 SHA-256: 46d6cca756c059f00837900a939064ec838bad81e87034a28a1b0cc1e4513d78
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, many of which are structured as link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=news+on+air+android+app PDF link annotation
    • http://hublihorse.com/uploads/userfiles/files/nuwam.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/sepanidosokusafekiwa.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/padagetivoxutage.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/nadidefuverofuruja.pdfIn PDF document text
    • http://emaaravm.net/upload/files/84087618102.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/57290109626.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/ruliruxaxopudekux.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/53021567683.pdfIn PDF document text
    • http://tlca.com/Content/uploads/files/64434429941.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/11175164121.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/83525135326.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb89301d33---bijil.pdfIn PDF document text
    • http://word.mn/uploads/assets/lurot.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/xixobowilimetelifavuw.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/42572032986.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/jofixaxenazagojupixo.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/vuserapefexigide.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/numoxawutepitikalegot.pdfIn PDF document text
    • https://salonrewards.ca/images/file/95486428179.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/sevegaligusizixozefubas.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/milapitunapenomobijota.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/laminesivajovej.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/88815753452.pdfIn PDF document text
    • https://windscrm.net/files/file/58748305036.pdfIn PDF document text
    • 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_off0000e81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81F 18056 bytes
SHA-256: 010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173
font_01_sfnt_off000116ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FF 10304 bytes
SHA-256: 0547c6d5b9fdc66e3c83d8fcd7473fba3a7cd32b10baa8b9521b6ae10df8c429
font_02_sfnt_off00012e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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