Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c744c60661f5c1…

MALICIOUS

PDF

69.4 KB Created: 2021-09-10 01:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4dbead69abb40b5897ce780aefffd66 SHA-1: e65163f841494ff98d86c2ff5872d9f6d50ea101 SHA-256: c3c744c60661f5c182ada98d7d27b97cca99f6050b511bc220430d807f39b720
126 Risk Score

Malware Insights

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

The PDF document was flagged by a ML classifier and ClamAV as malicious, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous embedded URLs that point to external PDF files hosted on various domains. The presence of multiple distinct hosts and the 'utm_term_redirector' heuristic suggest a coordinated effort to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://jjsgreatescape.com/uploaded_files/userfiles/files/70261368369.pdf In PDF document text
    • http://srmtteaparty.com/uploads/files/202109080908394233.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7bd90fa7e---23987744896.pdfIn PDF document text
    • https://pratham.one/file/24878021755.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66823078165.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/83524835831.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210903171011.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/kexetefibukabogabatog.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/93093139990.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/67102705388.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/86009864521.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/86060213452.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/63711630313.pdfIn PDF document text
    • http://hflchw.com/upload/file/lovobe.pdfIn PDF document text
    • http://agro-partner.com/Image/files/vepuxasasezuximebu.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/delisajiwewapijupis.pdfIn PDF document text
    • https://pepsima.biz/files/file/vimubijewafijemekaw.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/84234595697.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/11542668336.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/rutonijumipekobiv.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/33834588746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+root+amazon+fire+7+tablet+9th+genPDF 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_off0000b0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DB 14876 bytes
SHA-256: 338d0643cd24018e6b3fac90f016e54b6073ca9803eaffe42d4e1a09c0049f9b
font_02_sfnt_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 10988 bytes
SHA-256: 1a85a4e0729314ae8e045dcd3c4164bd75d76d6057435a470fce48aeafc69f3b

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