Malicious PDF — malware analysis report

Static analysis result for SHA-256 17375b7f331ef51d…

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 14:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 862a39ba6462ce3c19d34f16e7966dd4 SHA-1: 440d50249dca7012ad0c7847e59c84a76ae77a12 SHA-256: 17375b7f331ef51d57a9721a11bbfc1caa46999450b78f895a3c4ed7580d9f3f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or redirects users to malicious sites. The 'SE_URGENCY_LURE' heuristic suggests a phishing pretext, likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=toefl+ibt+practice+test+with+answers+pdf PDF link annotation
    • http://mengnuanua.com/app/webroot/files/files/fuvesosadawonebenev.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6b3af14c0---dopusapugapodotifub.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/xufomajat.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/14455479390.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109011031588524.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85164274111.pdfIn PDF document text
    • https://dhesient.com/media/kivuwofe.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/5272248805.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/pajisod.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/wanabotefozinalajomakem.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/tiwiwagezudujiz.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/77700432268.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/21080819250.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/rumukuwawutig.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/93478583867.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/2219366475.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/52413055076.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-10/20210910033519276918.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/57413112695.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210910141545.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/43154986761.pdfIn PDF document text
    • http://rnralpha.cz/res/file/sufuno.pdfIn PDF document text
    • 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_off0000d243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD243 16828 bytes
SHA-256: 5779211edb2addd5cd6130ff1594c1f8626523e0e0fa4177b96e961faba25741
font_01_sfnt_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AF 10904 bytes
SHA-256: 57d3704bb3dbd7f2eb5cb90ed38e92dc2b5dde0d0186a3931288f8c8d7fa60da

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