Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d3284de4ca418c…

MALICIOUS

PDF

74.9 KB Created: 2021-02-13 12:19:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a914f3fbaf6390599f37ca9b630776af SHA-1: 1527782ef6ab6dc12829ee5e965d7d042a2e51ba SHA-256: a4d3284de4ca418c1ae95019ebb632624c20f6632f04a392ebe1480592e5c4a0
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links designed to redirect users to external websites, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure points towards an attempt to exploit users by directing them to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/123?utm_term=production+possibility+frontier+questions+and+answers+pdf In PDF document text
    • https://xugilatopuke.weebly.com/uploads/1/3/4/7/134746985/gibazamifalibol_bowubetowuj_xutegibulu_fidokabo.pdfIn PDF document text
    • http://dinejokudino.22web.org/gitaxivimowotawatefov.pdfIn PDF document text
    • http://googsnat.space/843928273303taww.pdfIn PDF document text
    • https://vorufiduwesonuf.weebly.com/uploads/1/3/5/3/135314955/2610738.pdfIn PDF document text
    • https://lurekoba.weebly.com/uploads/1/3/4/0/134018443/domuzatij.pdfIn PDF document text
    • https://rikizanasurixa.weebly.com/uploads/1/3/1/3/131379420/sapunosemewamej.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/tokudapele/59644594067.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/3_day_eviction_notice_florida_template.pdfIn PDF document text
    • http://xonelamurojili.rf.gd/78045798738.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/sapopodikiremepobo.pdfIn PDF document text
    • http://kejarajavamoge.epizy.com/12509830457.pdfIn PDF document text
    • http://tozuduxaxikagik.rf.gd/book_folding_template_letters.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/89696702248.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/topics_for_formal_letter_writing_grade_6.pdfIn PDF document text
    • http://najaxobefirag.epizy.com/jezalufumexoripok.pdfIn PDF document text
    • http://mezotake.epizy.com/ccpa_full_form_in_education.pdfIn PDF document text
    • http://muvalinifotu.rf.gd/update_for_windows_10.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_off0000e4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F9 5612 bytes
SHA-256: 235f24466d6c79f5d2d4a46e8e645213422c7f6b5dcc8e1f49bd420ab444f698
font_01_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 10956 bytes
SHA-256: 0c629a0fe5f2e580d2e54e5e2b8edf14fb5338deb5a2472a73da608319910af1

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