Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5a0e42b2e9ac68…

MALICIOUS

PDF

69.1 KB Created: 2021-09-10 06:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac6a7c7a059de99881ed1f026273d5ff SHA-1: f19bf02182c4b29e7b02f5288a30c36606ddad34 SHA-256: 1a5a0e42b2e9ac68924e86afaed5830c12b5f081064f33a2a352bc95f265dbc3
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 high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to potentially harmful content.

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://vizit-k.net/uploads/editor/files/28659378128.pdf In PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/tijadeseratokuguwofuwiru.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/sizifidakokogovumuliruf.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/depidopobamolerebuvug.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210907070942.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210901171801.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16312322629202.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/18819284684.pdfIn PDF document text
    • http://telecycling.info/files/file/pidenakoditilevudomenanif.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/gf90etc983fao22vb14ml3jjfb/18233480102.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/95896962988.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/movonozagonitisodet.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/zuwidojax.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/bupuzoles.pdfIn PDF document text
    • http://budka39.ru/files/54571955302.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/kaziwepebopoloxed.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/9722270679.pdfIn PDF document text
    • http://konberdbio.com/upload/files/bafob.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fe4457ffb---47589453341.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/70673045542.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090604573773499.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/javokeradedavasugevejop.pdfIn PDF document text
    • http://megalaserasia.com/upload///4004358443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sivaji+the+boss+reviewPDF 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_off0000b24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24C 14420 bytes
SHA-256: 8c642ff32840f99762bd057e1023151806042ba2e788d114e77ca23261e3b469
font_01_sfnt_off0000d657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD657 10552 bytes
SHA-256: 2fc2eaea1d4269196048459799599e44a631851d1a97256a5e8ffaaec5241d45
font_02_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1