Malicious PDF — malware analysis report

Static analysis result for SHA-256 7373615784f209a0…

MALICIOUS

PDF

75.9 KB Created: 2021-09-17 01:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee4469e11265e736d6c28586789c5c4d SHA-1: 0aa621fb2c992e3d4dba09cf137c9533979c24fc SHA-256: 7373615784f209a0c06af7832f59eac70963434fe68348d192d7d287da901cea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to disposable hosting and appear to be part of a link farm, likely designed to redirect users to malicious content or phishing sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=asphalt+8+airborne+apk+download PDF link annotation
    • https://websbag.com/uploads/files/11278469006.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/56650645983.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/retesizoxamomexatupida.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/monotezeboxebuzabaverupag.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef9cdfe8b---82281460504.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/36764739364.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/52766501540.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8350ab006b80c3cdf5f9bf30c9627b3/silusunezufowuwaduzor.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/ledezorexutazonodajamag.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/36444700012.pdfIn PDF document text
    • https://greenways.at/userfiles/file/wiletenabaj.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/livaf.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/jiraj.pdfIn PDF document text
    • https://renetravel.ro/images/files/sabafifajimunowojarizofez.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/soxape.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/ruwuxade.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/pobopazapikutobubuvo.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/buxatolazisujekagagan.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/gosefofejogupupiwazugur.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/jadugosofitiwen.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/58952523129.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613ff1dd4faca.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/zorezubu.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/47378435629.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_off0000c2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 10996 bytes
SHA-256: 35c9b6e358f9bb0250c3e58d732893a1f15affc8547bc06b5cae349826bccd9d
font_02_sfnt_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 17552 bytes
SHA-256: f2f8c042dd90f459d8f7df0541c6be8c5039f4b0d0cc6d94a39f8478b7319a6e

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