Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e9600b775c25cd…

MALICIOUS

PDF

82.4 KB Created: 2021-02-12 14:18:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 66544355109b46e4f27f24e750225b78 SHA-1: e8e604e2fd4112d48a1683ce954ea03b1e839db4 SHA-256: d8e9600b775c25cdc2e40878122f28031d2402ff6c5b516482629d727e2b86c5
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://baarspo.ru/wix?keyword=leveling+guide+classic+warrior PDF link annotation
    • http://refarebadas.22web.org/api_platform_filter.pdfIn PDF document text
    • https://petabururumeje.weebly.com/uploads/1/3/4/9/134902787/3150923.pdfIn PDF document text
    • https://cdn.sqhk.co/tivaboloxome/wjbntnv/80s_music_free_mp3_download.pdfIn PDF document text
    • https://fiponadokimikub.weebly.com/uploads/1/3/1/4/131437640/wajobesado.pdfIn PDF document text
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/d91e01b.pdfIn PDF document text
    • http://thiswaytovogue.com/972650879084hrja.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/adhitie/31026346187.pdfIn PDF document text
    • http://ighelpcenter.xyz/killer_keos_skimpy_cbbe5g2ug.pdfIn PDF document text
    • https://vixeweno.weebly.com/uploads/1/3/6/0/136049701/8469660.pdfIn PDF document text
    • http://navalny.design/leather_bag_handle_templatel1agy.pdfIn PDF document text
    • https://livubefelamujir.weebly.com/uploads/1/3/4/8/134899239/gigizalo.pdfIn PDF document text
    • https://sagagokibifaku.weebly.com/uploads/1/3/4/6/134625973/rerur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gazinopalevigem.rf.gd/vopogofoferozuperowa.pdfIn PDF document text
    • http://zufarelizija.epizy.com/lonojetaru.pdfIn PDF document text
    • http://dakawarinuku.epizy.com/abcd_songs_naa.pdfIn PDF document text
    • http://zilajib.epizy.com/business_letter_template_example_word.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_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 5200 bytes
SHA-256: f83bf11f55eeb513bcb6c7929f871974671d381e4ca42e1f1acab2950f7ba021
font_01_sfnt_off00011795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11795 10964 bytes
SHA-256: 4e2bcfd8355f69c181d675d3911a5286923851ca5d2c0ce0c4ceb03333aeec63

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