Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c523dacd11b942…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 11:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e786741884d541e4980629bc1153b47 SHA-1: 4e02b41c32e564815cd394aa73b3a94e8c2ff157 SHA-256: f7c523dacd11b942f9649b9fd256deacafa641655fc2e39fa5eb10bbd5d4d690
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of a link farm and the lure of 'gta v online free money glitch' suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kamarkosong.com/contents/files/puvuruxasepawafu.pdf In PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161380c9d807d2---70255104506.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/39248183323.pdfIn PDF document text
    • http://wajl.net/img/file/202191122032.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/28050916475.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/65623925834.pdfIn PDF document text
    • http://erex.hu/upload/file/64203771170.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13250288661.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/tanewotatamufisigiwe.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613143f76ef67---58765723819.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/37800629362.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/pugexetedusolodiwumu.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/62451773511.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/widanugutubaxi.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/nupimevuduj.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/48978059872.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/jowalemasevojas.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/28325613477.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/47897886472.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/rapudigabeponezudu.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/mobevabesipiwi.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/40796682434.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210906075039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gta+v+online+free+money+glitchPDF 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_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 10836 bytes
SHA-256: 5bcd9a0445b5d211f9cdfc6ca7aeec5f9a72ecf7399701080dd5c5ccf10ce628
font_02_sfnt_off0001114b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114B 16624 bytes
SHA-256: 08593fb281c5563958091cb2454389d87a34f2ffbe7452405152936aa8984c18

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