Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b111c9a83d87055…

MALICIOUS

PDF

69.7 KB Created: 2021-03-03 06:23:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: af5a08225e88cb40d662e9766020f3a4 SHA-1: d6b478f4ec7138188619b9415c9d42e85ef25ce3 SHA-256: 5b111c9a83d870556cd79b26f90b6ab858ef475426fe5ba5bed4e77f5c96db77
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and one specifically flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=st.+clair+county+jail+illinois PDF link annotation
    • http://jopalebifu.iblogger.org/dobizivijaximunupo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443356/normal_6007b6cdc7561.pdfIn PDF document text
    • http://tewovenaj.22web.org/53921514048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_601313cceed1f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fefisapuvekebi.epizy.com/57172267450.pdfIn PDF document text
    • http://vidojizo.rf.gd/litexomefu.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/jnc_8_guidelines_for_htn.pdfIn PDF document text
    • http://sonazawokog.rf.gd/ponizofusefatuzupisunamuz.pdfIn PDF document text
    • http://xuxusemo.epizy.com/25505585214.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/46590115779.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/capital_expenditure.pdfIn PDF document text
    • http://bepenaguvofiw.epizy.com/36308707029.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 5108 bytes
SHA-256: f2300d247fd038bbfd6ea4ffa371637fb2d49334edb186ebb05cc0498955a06c
font_01_sfnt_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 10216 bytes
SHA-256: 2517765792d5da013d3c814e57cc1bb3db8952fcab53f69aa8226c4ae6e39e25

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