Malicious PDF — malware analysis report

Static analysis result for SHA-256 810bb93612b7b8c5…

MALICIOUS

PDF

70.5 KB Created: 2021-02-08 10:50:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fb8238653085947a4005455336934501 SHA-1: 77f3c59bd1add26cccf0980c48092a2616f61f47 SHA-256: 810bb93612b7b8c56522f2a83030bfe401950a1fcc9afbdb400356f8637a82d1
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URIs and the link farm nature strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wb?keyword=lagu%20harusnya%20aku%20dari%20armada%20band PDF link annotation
    • https://wokawopirajer.weebly.com/uploads/1/3/3/9/133999547/f3cdceb.pdfIn PDF document text
    • http://bajelow.iblogger.org/ctfa_microbiology_guidelines_2013.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/jzTvgjc/kubawusosa.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/gaUjddg/movie_premieres_october_2020.pdfIn PDF document text
    • http://merulabodonulu.iblogger.org/14110709655.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/5393742.pdfIn PDF document text
    • https://xitukamobem.weebly.com/uploads/1/3/4/6/134643312/1245875.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/rojoga-mipenozeni-faridelafelu-dagenenedo.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/xjbhgTg/81004228872.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/hj76rib/5992696212.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sazomo/puxezimamobejagijixelibe.pdfIn PDF document text
    • http://keporeninudo.rf.gd/79519681687.pdfIn PDF document text
    • http://bomepexajusopa.epizy.com/indesign_software_free_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/signalr_redis_performance.pdfIn PDF document text
    • http://zejagal.rf.gd/schwab_inherited_ira_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/cement_concrete_road_construction_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/18394794374.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_off0000d70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70E 5456 bytes
SHA-256: 5e7b9785a12fc752d99bb3162171bf345880112906e8042eb6b2a6ffe58866bb
font_01_sfnt_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 10372 bytes
SHA-256: b673d504b048a8e1b4584beacfe482de99169bfee10291d002706d418b630f84

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