Malicious PDF — malware analysis report

Static analysis result for SHA-256 0074bb3bf9e91823…

MALICIOUS

PDF

71.3 KB Created: 2021-09-20 22:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 948fc7369730aee92a8f59ea9e75e921 SHA-1: e263b4884701e9d3e70403d14ef8ac905c60d2c3 SHA-256: 0074bb3bf9e9182359c99df0728a75b42d72e58c2f620077847da2d3c2c1bd21
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://maudchristan.nl/ckfinder/userfiles/files/nikefedijejuloke.pdf In PDF document text
    • http://jshtextile.com/UserFiles/file///gidonap.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210918191752.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/napuju.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/jekobadolalofar.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/46026899209.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/somelisomaf.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/zodoligaditufojig.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/vutedazaponolorebot.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/75793855966.pdfIn PDF document text
    • http://cl-pub.com/files/files/76857969181.pdfIn PDF document text
    • http://abc-tel.ru/data/File/vukavupib.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613536f96e80e---jatogekojimuxogef.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/02/file/20210902_093334_189.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/firalifeziwererajut.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f16ee1698f---gixugu.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/pajineluvo.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/bapok.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/12127258289.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210908_120732.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/69202201548.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/58324357504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=can+i+see+who+viewed+my+ig+highlightsPDF 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_off0000b712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB712 10892 bytes
SHA-256: eb79a3f7f40ee37f28010c707ad88842b161434957050b2d87e138dab10a48c5
font_01_sfnt_off0000cffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 15440 bytes
SHA-256: 7044afa4302649ad3d04d29ac620bfffa8a41d7ed045df2390565050bcfe12bc

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