Malicious PDF — malware analysis report

Static analysis result for SHA-256 85860623d6f699b2…

MALICIOUS

PDF

71.8 KB Created: 2021-09-24 11:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 404e56dcbee8be2df1bc7e715c6b6b12 SHA-1: aa1b16989eac67c7dea1f32e1d0649a2ae12b777 SHA-256: 85860623d6f699b20aa7cadd324a856346ba85a6f6eadd44c366dc53bbce6677
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host numerous links on disposable domains, likely to redirect users to malicious content. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://jrpst.pl/userfiles/file/67643104280.pdf In PDF document text
    • https://harrisitalia.it/uploads/file/81674953690.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/35995640092.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f635b52f08---15056673886.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/47251350224.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/gejupogosizisebipewip.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/42477000036.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/bugebibugoxijawisozanuzex.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/lomalukabituzivalanigit.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16149112117c92---29502033663.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/mewisomevowogonofodonar.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/xenimefogujolamipaz.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/finabomawuwokuf.pdfIn PDF document text
    • http://video-cycling.de/files/file/godolezunupisakot.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/30825547250.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/47697976638.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/2109120914289596398wl2if.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/zulofipab.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/bujutovemorowefoxu.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/pelirelugifazeraku.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/torepadokijemutapupilotat.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/1950004320.pdfIn PDF document text
    • http://websitesample.in/atlantis/assets/ckfinder/userfiles/files/zuzagafakumusup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=trig+graphs+explainedPDF 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_off0000b78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78F 16616 bytes
SHA-256: 17963fc18aaa8f8659cea1da29dda0159b4b229d80155f1716498e12a857c5e4
font_01_sfnt_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 10516 bytes
SHA-256: 829f8b044a107cc59f01472eeba48577876d68e43af038831afcd05fc33b0e04