Malicious PDF — malware analysis report

Static analysis result for SHA-256 579cfbe836107155…

MALICIOUS

PDF

81.7 KB Created: 2021-09-22 12:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8065d766777503ec480e3bea0a8483a SHA-1: 49c284b3e6bd695dbf3c2e20359c182f0706456e SHA-256: 579cfbe8361071555f448267f7003fe4c397aa566a552b29a0696a5b1e2e09de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1614207c8a6356---28960162253.pdf In PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/7703135947.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/40161921473.pdfIn PDF document text
    • https://kapefashion.com/files/files/75408835084.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/balus.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/87848685356.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/genatob.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/98952066609.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/6920696373.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/kefadar.pdfIn PDF document text
    • http://schokofontaene.de/idata/kavupixumanikiritokigad.pdfIn PDF document text
    • http://wawa757.com/uploads/files/supuras.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/modarorebo.pdfIn PDF document text
    • http://web5gstore.com/Files/files/27284163469.pdfIn PDF document text
    • http://didula.com/img/file/siwoxano.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/jeburuwilagifumad.pdfIn PDF document text
    • https://ptogel1.com/contents/files/77048798063.pdfIn PDF document text
    • https://0900107678.com/upload/file/40432507274.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/puxakokofudekufufexim.pdfIn PDF document text
    • https://pindimana.in/uploads/file/52145000640.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109030658278235.pdfIn PDF document text
    • http://liily.jp/upload/file/20210908075259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=screen+hours+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_off0000db1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 10500 bytes
SHA-256: d1fdafa7d7974ff7af6b581c46569b7d1026e0d888cbb471e70c3e4465851ccd
font_02_sfnt_off00010aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 18276 bytes
SHA-256: b3b8b5a3b6ec49f6db89dc796be7c4886328daadb178f80f2a8f99a229507652

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