Malicious PDF — malware analysis report

Static analysis result for SHA-256 40888c3755ad0305…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 15:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61b3bcf8ee7931a157520eb80317e16d SHA-1: 3319b93b66b224df117fae3b34213759e77226ce SHA-256: 40888c3755ad03050db72983139791a31a71f5906665c902f4b87b7cdad61544
146 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains multiple embedded URIs, including one pointing to a raw IP address, which likely serve as lures to download further malicious content. The PDF's structure and the presence of numerous links suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://myphambambi.com/webroot/img/files/vagawijowedukonivoziko.pdf In PDF document text
    • http://notar-frings.de/userfiles/file/wiwakiv.pdfIn PDF document text
    • http://kaies.net/upfiles/210910165407755392ob05it.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/16764762311.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/86594770921.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/xitotusefebipok.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pegilelodasidizut.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/wuvugok.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/rovevezizeparino.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/muzudosiwu.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/filujajakug.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/476748d8b74b7c9655a7976cb12910f6/89418279487.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109011930448700.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5dbeae9617f1949c66f78b5e078bdae6/felozapogijexunifobexaken.pdfIn PDF document text
    • http://mkontakt.pl/dat/file/96461031729.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2bc2c4012---47109702225.pdfPDF link annotation
    • https://autoprofi.ua/userfiles/file/lamipoxiloniwi.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/mudukavev.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/11885861852.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/50781262624.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/82530452977.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/20676216452.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/nefuganerepusawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=indian+polity+by+laxmikant+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_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 17588 bytes
SHA-256: fe9ac2f9ffb761094eb9b1e861d6badbd040792e4a520af831aa242677060a28
font_02_sfnt_off00011d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D93 10656 bytes
SHA-256: 6c50f4619a0cb6f47ecea07c7f9b374dac07376c35229c12de65fb574f46bb08