Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b4c18e6a1756de…

MALICIOUS

PDF

66.7 KB Created: 2020-11-27 01:26:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b7c777fecbb996cb876b977e950125c0 SHA-1: 1937048a3bf01cb09819a3153be1dd2f3a37f143 SHA-256: a7b4c18e6a1756de038ddb3b8afee047089434a5ad1987e1ecb50f0660617e4e
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, appears to be a lure related to a technical document.

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
  • 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://traffset.ru/strik?utm_term=lee+introduction+to+smooth+manifolds PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384835/normal_5fbae21a682be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379043/normal_5faf69c211414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416660/normal_5fb82db10aeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409609/normal_5fb9d381dfc14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f8e18f8cd915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_5f90f0040e1ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384149/normal_5fbd8bd656a94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428062/normal_5f99bfc30bba0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_5f91dbf10e097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_5fa47e6ff102f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492546/normal_5fb7a1a5681a0.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/kexamoxusinixu/berea_community_elementary_school_website.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/air_cooled_chiller_vs_water_cooled_chiller.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/vuvavujefazev.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_off0000c977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC977 5200 bytes
SHA-256: 709569b0877727fe882bd307eba6aff1d0623864272f7fa0bcd1df53888699ea
font_01_sfnt_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 10264 bytes
SHA-256: 00301b0d4e0d0e556a5d3191fda3856c330dba4c548d1a4b5327252218f2444c

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