Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db0fbbb0f58f7ad…

MALICIOUS

PDF

78.4 KB Created: 2020-12-04 09:32:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a2a68b762b532ca9033051a917899c8c SHA-1: 5b7c669a617b29f436ce35ca9fd39b11b9f51866 SHA-256: 3db0fbbb0f58f7ad5012759db15649e1d25f668357a765c07eb388e179a72220
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by a machine learning classifier and ClamAV, with the ClamAV detection name suggesting a phishing trojan. The embedded URL and document body text indicate a lure related to "Anna university transcripts tracking", which is a common tactic for phishing attacks. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest potential for malicious JavaScript execution or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://trafffi.ru/123?utm_term=anna+university+transcripts+tracking PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419192/normal_5f9b5c9c4727b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f95e80331922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419218/normal_5f99a5a567d9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423752/normal_5f9fbd12e9e5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368768/normal_5fb8b78e9e0cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375698/normal_5fa202958f749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5f884eded3c61.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/936bf867-7efb-45ba-a580-eacd75a61b8f/xowuvifudebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd22ccb-6646-4073-8999-62a4a1abae69/41715572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aca6501-5455-444e-8598-832555a010e8/what_does_reactive_bone_marrow_changes_mean.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5240da13a450bab0fe7b5/t/5fc992da8562787517537dd4/1607045850968/vogudupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1add6449-0cad-4ef7-8db3-069ae449df78/2010_chrysler_sebring_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86c2e194-1847-4c75-96f8-1064b7ada041/sovurokibi.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_off0000f3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 5284 bytes
SHA-256: b16102598331d984d6b621b90642919ae82e6b85a656f385cd6839fa76b734fc
font_01_sfnt_off000105d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D8 11376 bytes
SHA-256: 3cd75b40da4a56eb6288a94183d680e54f2036d2a4dfecab57fd11f283458dfb

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