Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6a3a7318f82e2f…

MALICIOUS

PDF

84.0 KB Created: 2021-02-15 20:03:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e67a6964b6587a0f33e96edcb004244b SHA-1: 7eb6aeba80714bdb7b3610acbd0879cd58927880 SHA-256: 1d6a3a7318f82e2fc4e5c9c6a6fb6e251d8d216026584fdee5c84a24d186c4e8
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically leading to a site that appears to be a phishing lure disguised as a guide for typing Greek letters in Google Docs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for credential harvesting or further malware delivery. No scripts were extracted, but the presence of numerous external links and the high ML score suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jottigo.ru/strik?utm_term=how+to+type+greek+letters+in+google+docs PDF link annotation
    • https://tezolusubugejel.weebly.com/uploads/1/3/5/3/135314563/90c9db.pdfIn PDF document text
    • http://lixuzixewufixib.66ghz.com/digital_forensics_investigation_report_template.pdfIn PDF document text
    • https://xoboxevoz.weebly.com/uploads/1/3/2/7/132740619/medixagarome.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/2163575.pdfIn PDF document text
    • http://gujinir.22web.org/siwikabovarokuwuzejosoxij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zusobowes.rf.gd/gewibosolaxatenalozo.pdfIn PDF document text
    • http://josetevuj.epizy.com/13118728880.pdfIn PDF document text
    • http://tubupokus.rf.gd/ambari_kannada_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/lojitaxulamomisavuwumato.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/39629136507.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD90 6616 bytes
SHA-256: 862be5fcab8c4189779e3b1b536cfec73eb3ee031b05c2e363d5dc1062fadff7
font_01_sfnt_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 3136 bytes
SHA-256: 95b8098a4042feaabcbc2eb97379a5d053fb975780bc29df41deb7d226d425c1
font_02_sfnt_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 5252 bytes
SHA-256: e18c1ad6488fca1201316f882e2cd237f4106d6c5419bab56db81a86c95c6a40
font_03_sfnt_off0000fb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB37 11832 bytes
SHA-256: 2a56fa59d3695e53309716fab721c89b4695b7962743e2ea2acedcbd1874ff61
font_04_sfnt_off000123ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EC 19032 bytes
SHA-256: fd49e5a6f6ef8eb87f8f1d957ca365f0ecde0a29345d2673cd5e7e9a6ce28f12

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