Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5183574690bc5b…

MALICIOUS

PDF

66.9 KB Created: 2020-12-11 09:20:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1582a5700e5abf3fbce344959d85c62e SHA-1: 7843c99b3b74503052dabd92e915a4a669011831 SHA-256: 7a5183574690bc5b643155ad3f404852bf86a6d99e04249d8b30faee465f2221
154 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'Back to school night information sheet' which directs users to a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://traffmen.ru/aws?utm_term=back+to+school+night+information+sheet In PDF document text
    • https://static.s123-cdn-static.com/uploads/4411229/normal_5fc7b39c2b879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422372/normal_5fa5340781c90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_5fbdc867eec28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480595/normal_5fc2f420a9699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_5faafa8a6fa4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416504/normal_5fbee67ddeebe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d1a73e3-bf86-4889-abd7-c632f69dc5a8/fezemegisatirejuxa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7065b382bec7399f51dd2/t/5fcc8b3174a40730fb936387/1607240497306/56075416564.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50ee5bd14ff0dd2b76208/t/5fcf6b8ccaa95a391e6dd980/1607429009965/weed_strains_alphabetical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88ebf73d-98f7-43d9-96e1-f6f0ed74454c/bozimege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa6dc939-b30d-4781-b278-13bd3612d9dd/95036988185.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc19a8f40f1034a5caddecf/t/5fc2bba29d79364840e78fb8/1606597539560/6778566763.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_off0000ca1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1C 5408 bytes
SHA-256: 78b288128b0164246dd5f094a9641ebfbcd72470738d738fac065969df8d9c7a
font_01_sfnt_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 9992 bytes
SHA-256: 66fe1cf6cad4a66ce6e8afcec5372bc20c740cb1b04a6337ac9b68db7ad18d6a

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