Malicious PDF — malware analysis report

Static analysis result for SHA-256 92709e4fcca75519…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 05:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c46268f35d7796f56d93269b4bb9f0b SHA-1: 322d8fdf4548435e7b092ec7f0a500ea867b020b SHA-256: 92709e4fcca755195cd372045c19b4ee04162fa21235c00716f2508a9da4d888
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vinhomeshaiphong.net/app/webroot/img/files/57849612099.pdf In PDF document text
    • http://mecaniquekd.ca/upload/file/dedofideverovulujiseros.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130021fdf99a---94125472409.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210901181826.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/govusepowavabum.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb5f7a187---fozobifasabu.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/98029404509.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/65634729848.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/zerusidumuwu.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/bavoxujoler.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/80755872392.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/zilofafidifutaroxatev.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109112209149479.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/vobuvifateliwaze.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/vobigi.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/36214637904.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/jejagesefuvejosedatonif.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/92588516013.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/konasozemosigisuvag.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/pivamobiminuta.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/52551581837.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/88251660593.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/mikopep.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/97845967464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+remove+safe+mode+on+your+phonePDF 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_off0000da68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 18540 bytes
SHA-256: e849717136b7298ee7a580756d22f2988c48bd80d3e0d42bf557b37a73fb26c2
font_01_sfnt_off000109b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CB 10884 bytes
SHA-256: 682d9b433cb067334928763715cf9d2849d1b39134bbadd1574fbba7466a8819

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