Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0e5e09a294e107…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 09:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bdc9c608b0845d680f4a67cd2b697eea SHA-1: 01aeba109fe4cc1cb0481154f28e337a238d57d9 SHA-256: ec0e5e09a294e1070414c596ccbc5d932cc77c7b7cc975dac28a86aa18e42b9d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to trick users into revealing sensitive recovery secrets or private keys. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure suggest it may exploit vulnerabilities or lead to phishing content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://spellenindex.nl/images/uploads/15145380590.pdf In PDF document text
    • http://gulfcoastlist.com/userfiles/file/pofelokozubu.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/69580699280.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/jonokatadugonuziwo.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39318a6ff---melurekekurexupofemu.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/zidufewemu.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/wamikega.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/76174854940.pdfIn PDF document text
    • http://davobio.com/upload/files/jufefabobagiwatosepip.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130be9f0eda9---perafirabotowemunuti.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/warimos.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/55703324656.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/5583291323.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/sesafijikotusatim.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-04/2d06d8bc765b1f831f4f0c4bf98438a8.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=roblox+free+apk+downloadPDF 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_off0000d955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 17796 bytes
SHA-256: f0ec4ef2fa2ff5a5a9fff6a8552013e5bda597c4f17896147afe4dc5a83d7824
font_02_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 10600 bytes
SHA-256: 780c47ec62402ea07c7dc891a61e2892bb9eb3b072e0bd372ec8fafb005d486b

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