Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda5b13b73f6b886…

MALICIOUS

PDF

73.3 KB Created: 2021-02-28 04:29:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1e145d582fbd44c6645c31dd88f23273 SHA-1: 58779453889c545515350a59ce6d079332e78f11 SHA-256: dda5b13b73f6b886c8138cbd830f4df723eebfbcda16342f5b978122d6a907e1
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to literary composition, likely a lure to disguise the malicious nature of the links.

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 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://seumenha.ru/strik?utm_term=que+es+un+composicion+literaria PDF link annotation
    • http://pigigozoruda.mypressonline.com/84588908358.pdfIn PDF document text
    • http://ita-bio.fun/how_to_install_pegasus_shower_cartridgeyynor.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/42330636278.pdfIn PDF document text
    • http://ujjjrrrrr.space/21042586180xmc7e.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/what_does_12b_mean.pdfIn PDF document text
    • http://gevowavu.22web.org/65898795727.pdfIn PDF document text
    • http://diletemofuvufu.22web.org/defajobetafude.pdfIn PDF document text
    • https://jumekurokenawuw.weebly.com/uploads/1/3/0/7/130739991/9409142.pdfIn PDF document text
    • http://servempieza.site/whirlpool_refrigerator_water_filter_reset_buttongnpy7.pdfIn PDF document text
    • http://termometr-medikal.site/701854991567bui9.pdfIn PDF document text
    • http://postel-na-zakaz.ru/how_to_calculate_cash_flow_to_total_debt_ratio2d60q.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/wivupilu.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/81524099713.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livodubudo.rf.gd/kususavamepatebixi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 5140 bytes
SHA-256: 2fc4bdfb679051ab78f8801f0eb887c59f8fdc74c179a049e37c81c3b9073eae
font_01_sfnt_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 12124 bytes
SHA-256: 8f8a565d42549d20fbf6ee493be6b614bf52f21dec88f40be1aef6132bc73979

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