Malicious PDF — malware analysis report

Static analysis result for SHA-256 721358d88c85bba6…

MALICIOUS

PDF

75.6 KB Created: 2021-02-16 03:23:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: aec3167d1211ab728d12e7603c8246aa SHA-1: b7a863ee1e9555261f56fa3d6e0d50eab8dda7c6 SHA-256: 721358d88c85bba609c4cabb6e4d1a29775f34ee54e0b3635d8dfa8a80b3a354
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous external URLs suggests the document is intended to redirect users to download further malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its construction and potential use as a lure.

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://druttle.ru/aws?utm_term=nikon+coolpix+s33+instruction+manual PDF link annotation
    • http://regvoolkim.website/calculator_windows_xpncjxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375885/normal_600636f3453b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379377/normal_6006494eeb685.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478414/normal_5fce43c5f3c7a.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/4ldgiIH/45593722897.pdfIn PDF document text
    • http://shoop-fn.ru/line_of_symmetry_worksheet_for_grade_5fug3s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427273/normal_5fd0b7a45e506.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470016/normal_5fe09d36c7044.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/iOxgigj/91801954380.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485705/normal_5fee629ce1ce2.pdfIn PDF document text
    • http://1xbet-regi.site/embroidery_logo_positioning_guidelinesjuua3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485434/normal_5ff9dda68b433.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448719/normal_5ffded1caaa01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390074/normal_5feb5dbd5b3ef.pdfIn PDF document text
    • http://1pokypki.website/counter_sniper_tactics3nwmu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389104/normal_5fe242aa2ce19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 5344 bytes
SHA-256: 6ec7c13f4356ec05decc1f590a6737c24bdb997a091b84003c0d7af0ed27fd84
font_01_sfnt_off0000fd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1F 10476 bytes
SHA-256: 846235a287dcd048296e7d6d23f23e96be6dd247dd2d3ca00f2be55fbd331cf2

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