Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c47d03ff097bac2…

MALICIOUS

PDF

104.8 KB Created: 2021-01-08 18:23:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 987f619020158b63a0924352e46e55be SHA-1: 93752130e83e8e310a4d915fb844eada79d3891a SHA-256: 3c47d03ff097bac2a4e4357b0a312298cd1acd039ef7ee460d65807dedd80fd1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the primary purpose is to redirect users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafficel.ru/aws?utm_term=chromatic+music+sheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386330/normal_5fdf97f92fd6b.pdfIn PDF document text
    • https://cdn.sqhk.co/zijikunu/g7Mxii3/stunt_truck_jumping.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/d65a9bcae9.pdfIn PDF document text
    • https://cdn.sqhk.co/pabukerofo/jejdhje/gapanura.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/wii9cwB/28053386034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_5fdba41d0349d.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/333677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_5fc0992642e65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452154/normal_5fdaad4f2ad02.pdfIn PDF document text
    • https://cdn.sqhk.co/pevizopubok/jbvichd/launchpad_macmillan_app.pdfIn PDF document text
    • https://busozovamifolak.weebly.com/uploads/1/3/4/2/134235369/2520818.pdfIn PDF document text
    • http://www.opentle.orgIn 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://www.gnu.org/licenses/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012b80.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12B80 14888 bytes
SHA-256: 6a59b62581df7382f520801248dcf8657f676e959b87507526299c2741ab3475
font_00_sfnt_off00011b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0F 4912 bytes
SHA-256: 2920e014d27ef04306d6e0ea6da8b8c3e93ab36d043f032cf6bf8cd636ca3fd4
font_02_sfnt_off000154f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F2 13484 bytes
SHA-256: 0bd975c5514adebae070e645acd0625d3139d70570266b3021b32017a4ff9204
font_03_sfnt_off00018002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18002 16200 bytes
SHA-256: f4fd55ddcbd8ce9ebd7b22767d40bbcfb10373bf2e4442ea370447971bbdb078

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