Malicious PDF — malware analysis report

Static analysis result for SHA-256 6540dd337dea348c…

MALICIOUS

PDF

167.9 KB Created: 2021-04-06 20:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 31b9697362dc7bb4f01581deed10b889 SHA-1: 5fef6b74c84a06a166d414548a806fe4fbde282c SHA-256: 6540dd337dea348c93db50aa8e0b016b7a792543695c81e68727b319cc6e8dfa
94 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on seemingly legitimate domains but are part of a link farm designed to obscure the true destination. The ClamAV heuristic identifies this as a phishing trojan, and the presence of external URIs suggests a malicious intent to redirect the user. No scripts were extracted, but the heuristic for disposable link farms indicates a high likelihood of malicious redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.2052

Heuristics 4

  • 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
  • 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://www.uts.cw/sites/default/files/webform/bofuwidesuxugebogaxa.pdf In PDF document text
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/povufukawonafano.pdfIn PDF document text
    • http://www.pbttphtk.gov.my/sites/default/files/webform/33269367294.pdfIn PDF document text
    • https://www.woonsocketri.org/system/temporary/webform/danajon.pdfIn PDF document text
    • https://www.natsihwa.org.au/sites/default/files/webform/72789215659.pdfIn PDF document text
    • http://portal-mysigma.com/system/files/student-proof/pifudolaloxafedotodela.pdfIn PDF document text
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/87762274679.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/sovurusogizafubeb.pdfIn PDF document text
    • http://russian-ice-spb.ru/sites/default/files/webform/files/77599308563.pdfIn PDF document text
    • https://www.termis.org/system/files/webform/98565071062.pdfIn PDF document text
    • http://seiary.com/sites/default/files/webform/rec/55418097166.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.orgThisIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=toefl+exam+preparation+material+pdfPDF link annotation
    • https://printandmail.princeton.edu/system/files/webform/21338807989.pdfIn PDF document text
    • https://gradfutures.princeton.edu/system/files/webform/49692556615.pdfIn PDF document text
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/27560642257.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://scripts.sil.org/In PDF document text
    • http://scripts.sil.org/OFLAbyssinicaIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F597 5028 bytes
SHA-256: 05887caacaf38e5dd7e763223ab92a7d0dc30a8d23852252961640ccc334f353
font_01_sfnt_off0002069d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2069D 26064 bytes
SHA-256: 467c54f87792cd57074dee0d62becd2a67bc754ef7045aaf30c1829f6656ef01
font_02_sfnt_off000232dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x232DC 15892 bytes
SHA-256: a4003613c19ae993fb34df247cc4f06f372625b72dd47625ca2d5116ec2bd5ea
font_03_sfnt_off00026aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26AEA 4084 bytes
SHA-256: 4a4d69f2fa381023dd2699efc89d7443c9fd1222dd017bfd39e03ae16dbd26dc
font_04_sfnt_off000277b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x277B5 11920 bytes
SHA-256: e0be64b71e1c21c07981411a873bd1622e33db5bb09858d6e42b32274dd6ed58

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