Malicious PDF — malware analysis report

Static analysis result for SHA-256 405a642c43fa40fc…

MALICIOUS

PDF

62.2 KB Created: 2021-01-23 12:07:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 98f0e9d2149ae3da724264109537be90 SHA-1: 93666df3cebc82719d1d969dd084d0b14a69d8f2 SHA-256: 405a642c43fa40fccc4698e873ceaeec0e3e025ea5bd5adae42529e7354c6d3e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/aws?utm_term=floating+point+binary+worksheet PDF link annotation
    • https://cdn.sqhk.co/rukugewul/djcudjg/dezaxalupokoredipumaxiz.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/gRjhhi9/2020_election_polls_fox_live_map.pdfIn PDF document text
    • https://site-1176393.mozfiles.com/files/1176393/sling_tv_reviews_and_complaints.pdfIn PDF document text
    • https://cdn.sqhk.co/gagupibi/elSjjwH/susimagela.pdfIn PDF document text
    • http://wexixexebasober.22web.org/enzyme_activity_worksheet_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/fanaxixuxizabubi.pdfIn PDF document text
    • http://zanawolusebil.epizy.com/bijoy_bangla_keyboard_layout_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/twin_flannel_sheet_set_costco.pdfIn PDF document text
    • http://titomozuluvexov.epizy.com/murumarebefuxadeg.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/tabloid_broadsheet_newspaper_definition.pdfIn PDF document text
    • http://bekabugi.epizy.com/2019_gina_guidelines_asthma.pdfIn PDF document text
    • http://tikikenuf.epizy.com/guidepost_growth_equity.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_off0000b6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F1 5432 bytes
SHA-256: d1cb32089cc19f9ba3001dce5ef02e6e74d7959d82ce8d0a1459f69688a3ce91
font_01_sfnt_off0000c97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97E 9588 bytes
SHA-256: c71f07e5de49841cb3f73d954e8a4e7a7096bc6006c8696dcb59759253aa073e

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