Malicious PDF — malware analysis report

Static analysis result for SHA-256 c175c8a973490c4a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-22 10:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 548b41f9e539daa6e269c26af25c9d5e SHA-1: 67287596d83730258ad02f044643a628afca4ee7 SHA-256: c175c8a973490c4a0cac56352c5df9f9a8e5be7b764bb3ff90042003fe3dbeba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nothingbutsafetyglasses.com/userfiles/file/gumativ.pdf In PDF document text
    • http://nicenpos.com/userData/board/file/73831361838.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/21511038378.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-13/20210913013045148997.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/9376507098.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/bedafezexatijavig.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/nugovoxakopopiwubinulu.pdfIn PDF document text
    • http://baove247.org/upload/files/26540583240.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/89285569511.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/xedugafopufi.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/24323626067.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/niwupepu.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/53753832934.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/gipawijiriwigewum.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/80356304264.pdfIn PDF document text
    • https://olterus.com/contents/files/70727843364.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/70220810092.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d31a10f77---18792190064.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/69751089892.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/43056413396.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/sesezazugepamasumumil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=a+quiet+place+2+noah+jupePDF 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_off0000d4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ece1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 10680 bytes
SHA-256: a4d3571a71fa85ff6a52357dcc4c08ab41911f626a1ec625e89f17303847f882
font_02_sfnt_off00010552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 18424 bytes
SHA-256: 9e1ba6ea6c6139d0fe926daf913f7cb93677815b4edace2e2549d9bdc03a402f

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