Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24cb167c2312113…

MALICIOUS

PDF

96.6 KB Created: 2021-05-29 04:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 550d18ab0211c8e281aa217c2b80d65a SHA-1: 285a94d76e67fcc22532f83d28b5f14d3ac2fd23 SHA-256: c24cb167c2312113a4bced420cc9ddc0be09a6b130822d34054d8f41a37c332e
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, appears to be related to the lure text found in the URI.

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://xajibur.ru/strik?utm_term=happy+birthday+male+friend+funny+images PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380876/normal_6062a1ad5db76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417216/normal_5ff77b88cc4ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_6036bca59c0b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_602630c0d9b8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424666/normal_5ff7638fc7b25.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4455902/normal_60b18fc9af119.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492546/normal_6052717f8be0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465277/normal_5fd163ac3c104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475208/normal_5fd9ca2c8ef03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426815/normal_6005cc90772c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455660/normal_6055ce4000526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378607/normal_6068c93c7dceb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393183/normal_5fdf2e149ee04.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/95ac02ef-ff76-4889-bf32-0154b3057c3a/62390721014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3636f408-cbd7-4b93-af5d-ea3ae5f5ba2c/99051254609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1e204d0-a4db-4eed-8a63-45376f1fb9a3/2338316379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf176d9b-1f41-42a8-adca-5186cf6d91e8/yamaha_alto_saxophone_serial_number_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d33d4f6f-33cb-4b08-949e-e3d6d00d25f9/3675814428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666c6d20-a245-4932-a142-1c2ac57b520f/dds_discount_near_me_rancho_cucamonga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43291e18-c985-4527-a3fb-adab35d85bdc/whirlpool_duet_sport_dryer_will_not_start.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12561 5660 bytes
SHA-256: 55773d7ce93a57a0795937c4dfeb880736ead00a3831efa6c4f0ac75c424741d
font_01_sfnt_off00013875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13875 11700 bytes
SHA-256: 83cbaaac589051bafd60d511eba33cf166c380176b95fdcb4466d19bded2990e
font_02_sfnt_off00015fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD5 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61

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