Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f23ab50497a5a1d…

MALICIOUS

PDF

80.6 KB Created: 2021-01-12 10:46:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8bf529226dd372517a996de72d3b45bc SHA-1: a2eb05b63123ef0c67f0dc88b1b2ed92a133e8db SHA-256: 3f23ab50497a5a1dbc871e1284e8433a3a89abb6a6421c86dc8f937dc7a7e503
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'Libro de caracteres chinos pdf' and is generated by wkhtmltopdf, a tool often used to create PDFs from web content, potentially to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffset.ru/aws?utm_term=libro+de+caracteres+chinos+pdf PDF link annotation
    • https://mepokebifonamos.weebly.com/uploads/1/3/4/0/134096039/27290fc07d9.pdfIn PDF document text
    • https://site-1176021.mozfiles.com/files/1176021/93626726189.pdfIn PDF document text
    • https://site-1226575.mozfiles.com/files/1226575/financial_report_means_in_business.pdfIn PDF document text
    • https://zonujonuwug.weebly.com/uploads/1/3/4/3/134309714/2974506.pdfIn PDF document text
    • https://cdn.sqhk.co/vuritukupus/he66hge/34011811041.pdfIn PDF document text
    • https://site-1166670.mozfiles.com/files/1166670/94626996155.pdfIn PDF document text
    • https://site-1247095.mozfiles.com/files/1247095/6136533452.pdfIn PDF document text
    • https://piwutevuxave.weebly.com/uploads/1/3/4/8/134891910/6222443.pdfIn PDF document text
    • https://site-1177743.mozfiles.com/files/1177743/xopupusuj.pdfIn PDF document text
    • https://mufogijagojar.weebly.com/uploads/1/3/1/0/131070489/3168858.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/libosokune/1457906996.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/tevibu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 5080 bytes
SHA-256: e7b44840ee330eb65bfe75c6fe4d96e56c5a3981483372e098a399b8ea5be498
font_01_sfnt_off0000f56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 2508 bytes
SHA-256: 6668ef9af3ac6d5e8ba2b84e8400e6630225f3efbeae499ea7a6aa776704a303
font_02_sfnt_off00010081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 11304 bytes
SHA-256: e9dd3e1ecd1c2b12b2498645c61c632bf9e67e6f32fa3a6372de1dbc59bc9944
font_03_sfnt_off0001257f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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