Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b3ab4ab7a81947…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 05:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2a4ce24fd7a54271f5e7dc326a7b15d6 SHA-1: 7b2dd4c28357e5b5bc198dac71581f35d4298e86 SHA-256: 07b3ab4ab7a819479b0ea194f468d7d51a205c32e5bb6648d823b44b6e9f93e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing lure. The PDF structure and heuristic firings indicate it is designed to redirect users to external content, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://giovanninociti.com/userfiles/files/mawofuzavug.pdf In PDF document text
    • https://hsse.cl/files/75166395315.pdfIn PDF document text
    • http://faradbox.pl/files/file/22483151405.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/wajatamazizitekalexuvoda.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/10495391471.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/burewarigoroniti.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/pufepododame.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/99478990570.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/mobekebabepiz.pdfIn PDF document text
    • http://taociren.com/upload/file/2109060918304157527a2ou56rdt6f.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/mogoteninib.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/95961356838.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136035926346---tijagego.pdfIn PDF document text
    • http://palami.by/images/file/rawuwipinazatipeses.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/gejovepoziwojamosurez.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/61849923611.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/70343379877.pdfIn PDF document text
    • http://millecolori.it/images/file/97436500094.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/gujogesokajevozamexulogiz.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/25492535366.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/piwuwoto.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/51758433858.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/zowonujinadafazepakaxuwak.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/desozifemekupojapuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=format+sd+card+for+android+on+macPDF 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_off0000e1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 17680 bytes
SHA-256: be5d92f95659ed50e84eaf983ecd0b660bfdcc8fb4ce1a7289192718371fddc3
font_02_sfnt_off00012760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12760 10436 bytes
SHA-256: 7116ce8911f2b8bc737546a1f312711c42bc8854701c481d8d7c829ab0395a57

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