Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f5815cb4abce97…

MALICIOUS

PDF

74.6 KB Created: 2021-09-19 01:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 415ffa0e33e4e58ce84f85602b3b6174 SHA-1: eced693b4e82ece53d7e9b15cae793ea116e8537 SHA-256: 13f5815cb4abce9712b8e5a2cf1ac8d2409b1775c3625924f10adb65dd918474
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://fcimoveis.com/imgs/file/93712572456.pdf In PDF document text
    • https://rafaela-motores.com/userfiles/file/xerewaxavufojeleguka.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/sipefavitori.pdfIn PDF document text
    • http://yejida.com/userfiles/file/57841385470.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/74806813677.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/jiduxolaneluf.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb71de279---31667464780.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/47630911126.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/94229333746.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/38569334202.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/39097671652.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210904211242.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/javar.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/lifofofenujokadipiwokiro.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/86859737133.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109132224091477.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/munebafotezifuza.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7c73ba118---98590535234.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/43641013715.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/leguduri.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/86730055349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=roblox+arsenal+aimbotPDF 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_off0000c038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC038 17328 bytes
SHA-256: 0cdc0bad87efb1f153ec3062c3dd0efdc895dd2b66d6660f12d93b6c2b189cce
font_01_sfnt_off0000ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 10556 bytes
SHA-256: 8427627ddcd3996dbeab1a7a65d012f3f4704e135d67ec0e54c7eaf0fa581273
font_02_sfnt_off0001059e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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