Malicious PDF — malware analysis report

Static analysis result for SHA-256 782fd0f5fb097339…

MALICIOUS

PDF

72.8 KB Created: 2021-09-23 02:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 57d37fab080345f3521d5a2477751ea5 SHA-1: 005b76303718ab807f037b200ca8944386f96f78 SHA-256: 782fd0f5fb0973393258db3ea981bb38a3eb1fb5ab0569c1f44d1935026d94c3
134 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. The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the phishing/malware distribution hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/bkqm5aok7qieceruik2gl66g9s/wipop.pdf In PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/51646672880.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/2163411622.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/92892467524.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210923072328.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/fikomojino.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210907081802.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210914112015.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/towemefanefumege.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/22393803225.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/sojebod.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/vomaz.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/44344272459.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613915c03ad58---febajunop.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/64076022191.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/69999635025.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/fewigurelabifek.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/47535272218.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/labovuduvig.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/basomafaza.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7088809296.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/84540194716.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/siguvugudakomaxu.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/fiteduroxukilukinekebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=emoji+font+iphonePDF 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_off0000b960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB960 10260 bytes
SHA-256: 6e028e6b23338a9610450b9855126a594ae3caa17cf770932f687b03ecd7e9d7
font_01_sfnt_off0000d022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD022 17436 bytes
SHA-256: 8e8d54f6ca9f5672564f9d4379c797c3f25bd1d9c9eb03fb4e25dac41173106e
font_02_sfnt_off0000fd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1