Malicious PDF — malware analysis report

Static analysis result for SHA-256 3450802cecdeada1…

MALICIOUS

PDF

82.1 KB Created: 2021-09-22 17:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a24e48bc155e86c5ecd570e13df1f28 SHA-1: 84fd503f3c313f49014bf9c0dc68a928f9de1963 SHA-256: 3450802cecdeada1e27addf032e2499c4837eedf7948da33ca85c2748ccaaff8
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document contains numerous links to different domains, suggesting a link farm designed to obscure the ultimate destination or distribute various malicious payloads. No scripts were extracted, and the document body was unreadable, but the presence of many external URIs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://torbay.ru/images/uploads/file/2337243657.pdf In PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/gipazigilubisusijef.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/77911304293.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/bilul.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/24136320948.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/30399212833.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/gazarefedimov.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140938ee3a70---6195372819.pdfIn PDF document text
    • http://orderkai.com/uploads/files/56640767841.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/betodinesasegad.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/31328767859.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/xomopepugopisimaz.pdfIn PDF document text
    • http://indexone.ru/upload/file/51914027405.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210920190131.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/1tunlpsosep3s2vnqdd74cept6/18876591356.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/55644474522.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/62793948018.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jomejabufonemofufisetu.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/92117266879.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/ginobeturumotedipu.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/tulavelafufeguxanetafex.pdfIn PDF document text
    • http://mlight.cz/archiv/file/kafobef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bhojpuri+mp4+song+downloadPDF 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_off0000d59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 11056 bytes
SHA-256: 976c52d7952c0883012ff8f740692490e260219b19ee85199120b707aecc9410
font_02_sfnt_off00010710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10710 19544 bytes
SHA-256: 54399857b7fc5610f5d70c555dd2b12c9af5f481ce0cbc056bc8bd89d5646390