Malicious PDF — malware analysis report

Static analysis result for SHA-256 50dc1533f4184600…

MALICIOUS

PDF

87.7 KB Created: 2021-09-16 06:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 520af92360766f2d45b61c789cf104a9 SHA-1: 05198fb7b210ac508d4091d9015d1556f8835084 SHA-256: 50dc1533f418460013489b4f3476324dc341cbb166b447f73e51d151291ab4bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://pixomot.ru/uplcv?utm_term=tenki+jp+android+%E3%82%A2%E3%83%97%E3%83%AA PDF link annotation
    • http://columb-sklep.pl/userfiles/file/vivejuxegixojetiguteku.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/xaruzegapukimetewofatu.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/zatexifutefezawa.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/fodorugekatumidajalobisad.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/69151926336.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/92312157163.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/kenekunuxuniga.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/regokotapugurun.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/dopefo.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/50272364947.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/jujizigizutemiwitos.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/71290874970.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210902130933402728271.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/58050816558.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/natisekolinuxewosatuv.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/90431903862.pdfIn PDF document text
    • http://newbiiz.com/upfiles/file/28425787076.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210903095040.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/gekutinalilawixafebanivu.pdfIn PDF document text
    • https://norservis.com/files/files/xomerupos.pdfIn PDF document text
    • http://live-net.it/file/43542272699.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091116185885.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD1 2584 bytes
SHA-256: 504bc838f4ac9cb1b3e91e7c310806dc3504e9578e4985c040d2195c86dfd6c5
font_01_sfnt_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 10256 bytes
SHA-256: 02841bc75871d36f883c079ee0a0d2a049cb772fac354bf4f64dda7ca7fdce8c
font_02_sfnt_off0000fd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD01 22344 bytes
SHA-256: f78e768d3f1564630c11f22d751cb3f95c27a692761835ee68e7458922539c3e
font_03_sfnt_off000136bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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