Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c655c759077aba…

MALICIOUS

PDF

72.0 KB Created: 2021-04-18 11:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 3b1e520c517c52e930860159f00d47f0 SHA-1: 1bc68816223a4adda222c6d48f9bc7ad7f9d6ac6 SHA-256: 26c655c759077abaa7eee4527f599a740c94e3d4d8a9d399db2dff086a3f3119
126 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The document contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting an effort to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely intended to lead users to credential harvesting or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.enwidth.com/sites/default/files/webform/resumes/60015669747.pdf In PDF document text
    • https://www.mainephilanthropy.org/sites/default/files/wimatetomowitiki.pdfIn PDF document text
    • https://www.termis.org/system/files/webform/manejuwavujegajejumoxak.pdfIn PDF document text
    • http://www.friendlycc.com/sites/default/files/webform/47778491084.pdfIn PDF document text
    • http://www.sumnercountyhospital.org/sites/default/files/webform/sinuwoxifazuroli.pdfIn PDF document text
    • https://www.natsihwa.org.au/sites/default/files/webform/86947183128.pdfIn PDF document text
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/goxara.pdfIn PDF document text
    • https://www.dgs-interparts.be/sites/default/files/7838369457.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/71027525942.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=where+to+find+britax+expiration+datePDF link annotation
    • https://lib.asu.edu/system/files/webform/vabomabexajamoja.pdfIn PDF document text
    • https://minorsoncampus.princeton.edu/system/files/webform/vogifowisawab.pdfIn PDF document text
    • https://community.princeton.edu/system/files/webform/36479690150.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A0 4928 bytes
SHA-256: 6c207962a272ec45dc2a01ce76fdac3e7efa074f2e719d82d8fe68fbaaa47ea7
font_01_sfnt_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 9904 bytes
SHA-256: 12779967dfd9eed60fe51078f9f79bc53da0cb6a7018d7e4fab25ad90b23c312
font_02_sfnt_off0001053f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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