Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ac0344f4e03042…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 16:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00ba96f90393f331c3c76aa773366d7a SHA-1: 48acd819100095425a0d2aef9cb9732de710cd8d SHA-256: a2ac0344f4e0304255b97eddd4c9f42ad1e1da371fa0125186a2ce49db3e4092
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a strategy of using many distinct, disposable hosts to obscure malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wadirumshootingstars.com/userfiles/file///9375404692.pdf
    • http://viquadro.com/userfiles/files/vajadexewomolabutugo.pdf
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/xowibalukegefag.pdf
    • http://sbs-group.co/userfiles/files/9477078028.pdf
    • https://unitedfightalliance.com/ckfinder/userfiles/files/57317704103.pdf
    • http://huonglonghotel.com/uploads/image/files/dururonutetikogaxejadutu.pdf
    • https://sibois.eu/userfiles/file/gowazepiso.pdf
    • http://hoachattn.com/image/files/34786838138.pdf
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/87336979368.pdf
    • https://weekendtripskolkata.com/userfiles/file/98852222373.pdf
    • https://globalmediaminds.com/uploads/files/3977026679.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137fcd553f18---nunujatox.pdf
    • http://sjhtractor.com/d/files/39220792696.pdf
    • https://i-try.tw/upfile/files/2021/09/08/52743604686.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9c946b323---3756921363.pdf
    • http://td-mg.ru/uploads/files/98195189049.pdf
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/7550581431.pdf
    • https://fonixkoncert.hu/upload/file/nosubofafopisu.pdf
    • https://jatransfer.com/userfiles/file/55389795969.pdf
    • https://fullprotec.com/ckfinder/userfiles/files/gokupufosanobabe.pdf
    • http://mayingiabao.com/upload/files/sivepitipozeko.pdf
    • http://test-immo.com/file/puzidod.pdf
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/jajafovuxadula.pdf
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/40082370313.pdf
    • http://gdlejia.com/uploadfile/files/20210904_082333.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=addition+and+subtraction+of+decimals+horizontal+worksheets
    • 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_off0000db06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB06 16792 bytes
font_01_sfnt_off0000f318.bin
78a0b739beedaef51ee0da10d4a2b02076765e75ceba9a7f8fa54f86a7acb6f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 17424 bytes
font_02_sfnt_off00012025.bin
56603d90ea7d46d4978d21fc559680d88ad1895fe1fcce6630c034b77854d2ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x12025 11200 bytes