Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7540a23b5a705f…

MALICIOUS

PDF

85.3 KB Created: 2021-09-09 06:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3b3eaafed983252a014f4f985ad0d95 SHA-1: 4325ff960fe3cdcedd26a8bca4d2657f22cbdb38 SHA-256: 5c7540a23b5a705f408caae31378f91f17653c82138ac53878fbdc7717dc629b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating it's a link farm on disposable hosting and a lure for password-protected archives. The presence of numerous unknown URLs suggests an attempt to distribute a payload, likely through a multi-stage process involving an archive. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://scantech3d.com/files/82225829188.pdf
    • https://beauty-full.ru/uploads/files/pakowuvutufujebuwopazitub.pdf
    • http://chelseafoodmart.com/uploads/files/nadalalekegot.pdf
    • https://receptabc.hu/images_banner/files/49849776546.pdf
    • http://findingthegrey.com/userfiles/file/vibiputigofexumu.pdf
    • http://anhhieu.vn/hinhanh/file/senawusamobagufizo.pdf
    • https://frutalmente.pt/site/upload/file/53579135894.pdf
    • https://ofertaromania.ro/ckfinder/userfiles/files/29255474497.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613619c639fb6---mexirebefifegadireda.pdf
    • http://poptheme.cn/uploadfile/files/20210906_164243.pdf
    • http://www.jindatunnel.com/up_files/file/pojilopugezexajaxerewates.pdf
    • http://bielle-srl.com/userfiles/files/40355805281.pdf
    • http://axwelindia.com/uploads/20620640309.pdf
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/bewulujizulozevu.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/32864833215.pdf
    • http://fazekaskozpont.hu/images/upload/file/22979149566.pdf
    • http://kup-vino.cz/web/ckfinder/userfiles/files/towewaritodadavumepezu.pdf
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/25511981650.pdf
    • http://royalrep.com/userfiles/files/89368464293.pdf
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/64785675723.pdf
    • http://kowel.com/ckfinder/userfiles/files/1630824612.pdf
    • https://mytekas.com/UserFiles/file/98235467725.pdf
    • http://megamento.com/_UploadFile/Images/file/fadewizuzenegemafos.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613139a6b61e5---12540307940.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=project+igi+2+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e803.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 16792 bytes
font_01_sfnt_off00010015.bin
1904fc2e05edc7d6839af5e6718035181e210ad4f76d141badcea592591851fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 18156 bytes
font_02_sfnt_off00012f8f.bin
bb2135198137ab578780f77bdfb7a5297d569476a2b619beb96240174a60bd0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8F 10688 bytes

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