Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad26108d93ba51c1…

MALICIOUS

PDF

72.3 KB Created: 2021-06-02 22:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b36d97e67efd94edc72d50fd8c2c0ed8 SHA-1: 55b6f25860302e19b2d090197a2ce0fa16953dbe SHA-256: ad26108d93ba51c118d9ff9a31156dd7e586883cfee03affd93ffcf78c85b74d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to an 'event html template free'. No scripts were extracted, but the PDF structure itself facilitated the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://druttle.ru/123?utm_term=event+html+template+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413242/normal_604df1c4d7098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426972/normal_6033b5103cab5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451929/normal_5fdeefbea0521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460690/normal_5fd95c284ebd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413109/normal_60277610b51da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428033/normal_5fd88aa63542a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425224/normal_5fc6cda4bcfe9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452835/normal_5ffde45611991.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aa1084d-7014-413a-82ad-3d93cc25d49a/kowabebexusimagajix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4797b372-b9a7-4d99-b4b3-c35de58d1c41/bram_stokers_dracula_movie_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df5abea2-3f9e-402e-affc-5cd65a254e5e/tumupawakerorig.pdfIn PDF document text
    • http://gonumutat.pbworks.com/f/vamurenu.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144416577/night_owls_de_jenn_bennett_sinopsis.pdfIn PDF document text
    • http://gozuwef.pbworks.com/w/file/fetch/144497625/71178977831.pdfIn PDF document text
    • http://wixugigir.pbworks.com/f/fma_and_football_worksheet_answers.pdfIn PDF document text
    • http://gazoridixilu.pbworks.com/f/94750711619.pdfIn PDF document text
    • http://zufogopojut.pbworks.com/f/93939849078.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/w/file/fetch/144497136/mafusirumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfe8c1b4-701d-40ff-90a6-60b1bb342786/how_to_change_hutbit_scale_to_lbs.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://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9F 4980 bytes
SHA-256: 931cd687ed07060870f9b47dd494c0e9c46c32b1401bc70c960405a6b2ac6089
font_01_sfnt_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 10360 bytes
SHA-256: 9b5a65312da725cb1859de599b0254c30fb3c8cde7114c50fddf8dab3b1aca6b

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