Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9ed7c231214d4b…

MALICIOUS

PDF

65.7 KB Created: 2021-02-26 05:22:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a031c207d2a50a18916d8ad402164595 SHA-1: 584c6f675888b9f7882edb7dafcd673320a61239 SHA-256: 9b9ed7c231214d4b34292c1da00665bc43f5df74dda7f7bfa57b2e57c5dbe07b
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of many links suggests a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=zeki+7+capacitive+multi-touch+tablet In PDF document text
    • https://budamasut.weebly.com/uploads/1/3/4/9/134903336/3382173.pdfIn PDF document text
    • http://disetikala.22web.org/zulekapugefogagila.pdfIn PDF document text
    • https://pujawemufupu.weebly.com/uploads/1/3/2/6/132680931/9a7d0d1de2052b5.pdfIn PDF document text
    • https://cdn.sqhk.co/juzivadareka/jfvOeCe/pictures_1_to_100_prime_numbers.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/hhehagf/castle_clash_regu_royale.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/7c964f436d8.pdfIn PDF document text
    • https://finubakexa.weebly.com/uploads/1/3/1/3/131383318/b6f81567a88d8.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/jhhhgjh/36847008192.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5feda1d4ba91c.pdfIn PDF document text
    • https://cdn.sqhk.co/derepinejabi/jiijgjd/texas_tech_tour_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_60163caed75b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_601be0f4114cf.pdfIn PDF document text
    • https://cdn.sqhk.co/rorefevobo/fiigfij/ax_les_3_domaines_pistes_ouvertes.pdfIn PDF document text
    • https://cdn.sqhk.co/fidasawon/iLIC4ib/virtual_friends_reimagined.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491148/normal_6035dc999ec40.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/najipavez/embed_access_report_in_email_body.pdfIn PDF document text
    • http://kolegigogar.rf.gd/35570856338.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_off0000c55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55B 5232 bytes
SHA-256: d0a0acd442f98c19d99c14973b6dc270d0a24655607eea25174aeb209199cec6
font_01_sfnt_off0000d71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71D 10152 bytes
SHA-256: dbeb68157906fe9e6a7778dc2584670e216fd1356442c591fe8588b5dabc3380

Open this report in the interactive analyzer, or submit your own file for analysis.