Malicious PDF — malware analysis report

Static analysis result for SHA-256 44dc770b87c74d9b…

MALICIOUS

PDF

79.1 KB Created: 2021-10-06 22:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 87675f05d79af5446b3840f2cc0e6bcf SHA-1: 34a9cf2e2af887ac26360dafd25875967aa0fbe8 SHA-256: 44dc770b87c74d9b80f51bbcb41bf00a6ca55c1e2abd9c7b0fb2571a2a386ad6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or redirection infrastructure. The heuristic 'SE_URGENCY_LURE' indicates the document likely uses time-sensitive language to prompt user action, a common phishing tactic. No scripts were extracted, but the PDF structure and URL patterns are consistent with a phishing campaign aiming to deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chcial.ru/uplcv?utm_term=food+quiz+questions+and+answers+2017 PDF link annotation
    • http://airzo.net/userData/board/file/vubofozezibo.pdfIn PDF document text
    • http://westfield.qa/multimedia/userfiles/file/21666579396.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210903233359.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/44094446684.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/sibuw.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615add78550a0---pevowesaxo.pdfIn PDF document text
    • https://hkki.org/userfiles/files/vopopezugigapan.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/55224162311.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/jolojolosugopub.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/56967771786.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/rofezevepabijikugibenot.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/96218191889.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/wejapunebisudinizeli.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210924185138_346356722.pdfIn PDF document text
    • https://magatek.com/documents/file/93046747358.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/36878471423.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/56367039332.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/botaxir.pdfIn PDF document text
    • https://castel.ro/userfiles/file/61780885966.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615738028c42c---solazen.pdfIn PDF document text
    • http://flexa.cz/docs/file/4980031350.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/velemomiwaxawedis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ced7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED7 10908 bytes
SHA-256: c09aa1d15c85f5207d1ec4da7d63874e2cf100ddf98955c703463653bf313898
font_01_sfnt_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 18040 bytes
SHA-256: 0412539f5305b622e31c99e20693a5d2f301ebd0f5df0c3a07a88c8cb69e4127
font_02_sfnt_off000116b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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