Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e949170c80262a…

MALICIOUS

PDF

72.6 KB Created: 2021-10-04 02:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 57ee94083318a2315da76b8e563499d7 SHA-1: fd51cab0f32b5c2432c4a431fb76a5c3fc8f4725 SHA-256: d1e949170c80262a6d747ef21dadce76f70030821beceed8cd4f8fa25de4f597
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially compromised domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://architettogherardi.eu/userfiles/files/revuga.pdf In PDF document text
    • http://timeyear-v.com/userfiles/file/tixavadopomuwigozaj.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/getifafo.pdfIn PDF document text
    • http://uhorder.com/upload/files/56796785458.pdfIn PDF document text
    • http://mlight.cz/archiv/file/neleg.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/29599380094.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/21945979841.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/34666584813.pdfIn PDF document text
    • http://dogwarts.ru/sites/default/files/file/vaborikawifufujubutosu.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/3448233392.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/wupivoluxokosoruvobemam.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/wuvizemepasowodexibad.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/17605417892.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161461fccdd21d---pugokusenakitafowugi.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/91245089782.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/sutomiva.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/kelubaxuxudufuzasubopo.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/vabivaderugoxexotex.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109251504402055.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140aecbbcbcf---28662946780.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/72398920993.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/92206829436.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/6592963630.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/bunawiviwidabuge.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/tovavalogunaroneroxil.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/dumewukezebopogesugenovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+to+do+if+your+not+going+to+collegePDF 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_off0000b570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD82 18236 bytes
SHA-256: f9e27ef550887df039a717419f8b540262298725c8457c341e207b06ef3c854e
font_02_sfnt_off0000fbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 10796 bytes
SHA-256: fcd60882308d0b0b6fff5dd6ac00855c1ff3996cafa4e8e069908348b9a7c42c