Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d1c3cc596e9367…

MALICIOUS

PDF

63.9 KB Created: 2020-12-01 18:17:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cf0f00e4469081727f7ca79e3d491249 SHA-1: 9594138841d2228081ff6f9e02b3e7b959de474d SHA-256: 23d1c3cc596e9367683fe16c9996c41ac372f47bf2ec6f189d961865223c76a0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm containing 26 external links, and a ML classifier indicating maliciousness. ClamAV also detected it as Pdf.Phishing.Trojan. The presence of external URIs and the link farm structure suggest an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/aws?utm_term=formal+dress+rental+baton+rouge PDF link annotation
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/7977672.pdfIn PDF document text
    • https://zireguxeked.weebly.com/uploads/1/3/4/8/134863403/viwitoxipeto_disapuvadudutu_porajejev_loninunijibur.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/zaxegatosukogab.pdfIn PDF document text
    • https://mugilofovoki.weebly.com/uploads/1/3/4/6/134616553/2824103.pdfIn PDF document text
    • https://duxevuwelinabim.weebly.com/uploads/1/3/4/3/134353564/3713777.pdfIn PDF document text
    • https://xuzufudoroxibu.weebly.com/uploads/1/3/4/7/134755415/genabexapapigokuteg.pdfIn PDF document text
    • https://tazorigebug.weebly.com/uploads/1/3/4/7/134766075/47914ebcfb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/sodifo.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/fiviw.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/bcit_burnaby_map.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/31656874044.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/7up_album_songs_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/possessive_apostrophe_s_exercises.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCD 5076 bytes
SHA-256: f65f9e29f8b60ce512af7f498562234afeffc8701382a488a8061f28b85afd98
font_01_sfnt_off0000c0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EC 10548 bytes
SHA-256: 76e850472ce721f090bb576057fcf7e8f2e9b0741a0b4701d82d0ecc9b341690
font_02_sfnt_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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