Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c15adf84131b971…

MALICIOUS

PDF

79.5 KB Created: 2021-09-11 23:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9d794f53141d7cd9303345a62b50c0ce SHA-1: 4f7c94017c9b922605e9533f6dc3e6da64c9ca15 SHA-256: 7c15adf84131b97146029f20179b2da892503ea2a423d3df4cb25f7c2be913c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of a link farm with numerous external PDF links suggests a distribution or SEO poisoning campaign. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://microsolder.hu/userfiles/files/75613425896.pdf In PDF document text
    • https://learn-atdi.com/uploads/files/wasalobawilalafitevuxofi.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/17996728950.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/63251023482.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/wowisalaroligidenim.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/mapesadukefijozumaraz.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/93384127525.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/dabivawegalazonadux.pdfIn PDF document text
    • https://educhina.mn/editor/files/71964083627.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/99987722557.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/fawewonugib.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/4186009485.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/1897735968.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/51543299378.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/zebagumuxidiwazomisek.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/36624468051.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/fomowowuzulozesinexox.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/29801284129.pdfIn PDF document text
    • http://gensugroup.com/upload/files/89622404773.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/79213789493.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/35817840622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=atomic+radius+of+bariumPDF 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_off0000d30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30D 17456 bytes
SHA-256: 2f006b92abaab2586ce94e4c264dee8a8cc0968dd6b58e7010848cad6262046d
font_01_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AA 10576 bytes
SHA-256: 8d3ec3e7badd56ab3fb43c193334cb8e6f885c14384aa70cfab412ed58c2971e

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