Malicious PDF — malware analysis report

Static analysis result for SHA-256 af675b165c8a27ca…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 05:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e8e78685153ac66c4262d3518280de15 SHA-1: d229559f2f78649d4c0d7afccc653fe0b2abc453 SHA-256: af675b165c8a27ca98c5a71f2bbbea649220aa9a47e29b1da12053365df8f2aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, 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 redirect users to malicious content. While no scripts were extracted, the presence of many unknown URLs points towards a distribution or phishing campaign.

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://thucphamchucnangmy.vn/uploads/files/rogifebumo.pdf In PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/xelasemuvixirobut.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/33219795594.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161347893d6ebc---93529839806.pdfIn PDF document text
    • http://52963566.com/upload/file/202109030219508231.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/69898017521.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/67354107911.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/bovizeda.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/vodojefobasopexufagebiza.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/batamunovudedeke.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/wanavokev.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/71336699431.pdfIn PDF document text
    • https://ms02bet.net/contents/files/65600983556.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109130827352190.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/66144974875.pdfIn PDF document text
    • https://gameclub.by/uploads/files/votudukuxitusej.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/70313305406.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/22960544332.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161403c5ea824e---87192653814.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/60552946236.pdfIn PDF document text
    • https://kimcert.org/E/file/suburudafiduv.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/56494920434.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/52961328036.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/32201002828.pdfIn PDF document text
    • https://purefeeling8.com/data/file/51247765745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=live+wallpaper+engine+for+androidPDF 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_off0000e169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE169 17724 bytes
SHA-256: 57a004664723699c746bc3a45825c599e4af62d5a149f059668cb91e58bc10cf
font_01_sfnt_off00010f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F47 10516 bytes
SHA-256: cf1287301692f874b59d7f9b23ea0f24e317e31ef4f2f64dee53559d92fcdaf1
font_02_sfnt_off00012722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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