Malicious PDF — malware analysis report

Static analysis result for SHA-256 497151438dd0e2e2…

MALICIOUS

PDF

71.9 KB Created: 2021-09-11 17:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 108d3b17e610eeefaa763ea9ecd3fc87 SHA-1: 5233809cdb4e6af6e1d9cf599a2f551b4bb8271a SHA-256: 497151438dd0e2e29d0c19023358f3b8f371554897a436fd3a5310ee89078df7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://trystsalonri.com/images/file/36419396844.pdf In PDF document text
    • http://www.lnk-creation.fr/upload/file/88136135665.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/60772330819.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/vigejumisanet.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/245395330.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/63786465819.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/rovapefutowagulegew.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/86536086822.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/5715112662.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/57806759113.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/faforaniwife.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/monala.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///66128155599.pdfIn PDF document text
    • http://ud2-140.com/files/49026346553.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/buwamujorusufogarufi.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/xorefawagafip.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/zorekezoborupodototeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+long+can+cooked+chicken+last+in+the+refrigeratorPDF 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D5 15852 bytes
SHA-256: 51091099cf603f8e5dfe395eab020b432f721247f451fe7a167e3b6964a93380
font_02_sfnt_off0000f936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF936 10924 bytes
SHA-256: 92554e9e55cf1db270e0a09ce5765e3e20685d2af9a4ceb1bc9140bbd593d46b

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