Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a68297289a9fd3b…

MALICIOUS

PDF

74.0 KB Created: 2021-01-19 02:34:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2510dd0bf0b9d08bc1f053a8f89083f5 SHA-1: 3c73ee3628e3d36440fdd5e7628e8b79bac05cbb SHA-256: 3a68297289a9fd3bfb4b1b550427ac5f10ba07d2568e495cbae33e79f17cdc94
116 Risk Score

Malware Insights

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

The PDF contains a malformed stream and an embedded URI pointing to a suspicious domain, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. Although no scripts were explicitly extracted, the malformed stream and external URI suggest an attempt to exploit PDF vulnerabilities or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://traffnew.ru/123?utm_term=dungeons+of+doom PDF link annotation
    • https://cdn.sqhk.co/luzeginu/hf8JFd9/vojalugibozot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485322/normal_5ff97bffb3436.pdfIn PDF document text
    • https://site-1253250.mozfiles.com/files/1253250/salvado_de_trigo_grueso_informacion_nutricional.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475563/normal_5fc2ca66efee1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_5f97469135ea7.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/yDhcmgh/nolajalarinifadituzinijot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426066/normal_60057e3a8e42e.pdfIn PDF document text
    • https://site-1176044.mozfiles.com/files/1176044/live_price_of_nymex_crude_oil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446643/normal_5fc809c8dbac9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f9318f74152a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491669/normal_5ff4a5c2ccd0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376854/normal_5f99ca8e1e28c.pdfIn PDF document text
    • https://cdn.sqhk.co/xopigotax/aojfaX2/25950270333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_5fa5036bc6a9a.pdfIn PDF document text
    • https://site-1176033.mozfiles.com/files/1176033/starfall_math_clocks.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481406/normal_60050c64e1e51.pdfIn PDF document text
    • https://site-1228635.mozfiles.com/files/1228635/kmspico_windows_10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481671/normal_5ff5105cacc91.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/jiwisigetizoxif/xafodufakide.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/xeloranekonukegerozakutak.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_off0000e5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 4888 bytes
SHA-256: a781603de29a7547cc8add9c3877885647c575be25f5e77db71411637ee33dd5
font_01_sfnt_off0000f665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 10580 bytes
SHA-256: 56bd135cd681e9da8d30408b58860650268d04ba35fa3152a057f96be4fdbc04

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