Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f50430c5c508fac…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 17:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1646b10f959d5b1e755737cc4a031dce SHA-1: ab5d77ed3e288698914bac28ffa834f27e5252e5 SHA-256: 3f50430c5c508facc4e5d63d6dc99e65eee51b24a6b8e640a47d64d2cc7ef0cf
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. It contains numerous external URIs, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate that the primary purpose is to redirect users to potentially malicious websites.

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 https://drafthe.ru/uplcv?utm_term=the+vanity+of+human+wishes+pdf PDF link annotation
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161427f75a6057---zikojidujope.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613efef26ef4e---xisosujogetajupazonan.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/dapolela.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///muvinofaloxuxofifoga.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/zoponuzadefulasufib.pdfIn PDF document text
    • http://lgassociates.in/uploads/roroxolukebufuluzabeg.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/potawolamivolobuwiwupaf.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/77586341908.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/sogigofawidimabovigi.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/janozutote.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/87108442741.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/bupewitijik.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/vajonudosorolape.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/72425374571.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/pejawimiropij.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/jizema.pdfIn PDF document text
    • https://spacio.hk/attachment/file/suvifoxiseroxibuxezil.pdfIn PDF document text
    • http://imi.vc/upload/files/17122171464.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210904073350.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/1330139196.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/bofipizarinunojijap.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/68200400728.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/9415234335.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/pekikoreduzejexogulojerow.pdfIn PDF document text
    • https://bawauang.com/contents/files/powizagipo.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_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 17552 bytes
SHA-256: 1556c0a5d716f1066e6b3b8298e900bb4950bdd8a1fc05e50f64c22431692639
font_01_sfnt_off00010d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12551 10944 bytes
SHA-256: f6b9690ea949d8812f04866ba7b9dd24c00db814d5cb69980ec1a3e4d3b08f41

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