Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc538a24594f0e27…

MALICIOUS

PDF

83.8 KB Created: 2021-09-10 23:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 0c88dd2417163c036b3e091a2d4244ea SHA-1: 8faf404fe815fb46504b0ffea13b51ca2757aaba SHA-256: fc538a24594f0e27e86d9722f27b2ffdd30dd2ec03355d38d24ec3ec63d679f8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://les-dvorik.ru/userfiles/file/19234301369.pdf In PDF document text
    • https://marbletreasures.com/uploads/image/files/62962017329.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/lafone.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/93351683918.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/jedenuzumu.pdfIn PDF document text
    • https://gameclub.by/uploads/files/xevawulobazez.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/73603779180.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/papemutove.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/1840328002.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/13139293283.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/tepusunoruni.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/rojofu.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-4/20210904193848635652.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-10/images/files/muxepozakurujifowofapufot.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/10951515945.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/7056783315.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/88357270723.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/90174049088.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/26785902237.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/wirizufizabaramutoju.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/fuxex.pdfIn PDF document text
    • http://sakem.org/userfiles/files/zidotijulin.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/fuwotajew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=genshin+free+promo+codesPDF 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_off0000dfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 10616 bytes
SHA-256: 47676c5a0e2b0561a2758ecb8b8355705741d3b2747df39b4a4ca99f1690e623
font_02_sfnt_off00010ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFB 19032 bytes
SHA-256: 97e222046c95a89f14f939ea4b25c78990a1758d011b6f2c0b8f701b741e6dd5

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