Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8c7eba91814473…

MALICIOUS

PDF

76.6 KB Created: 2021-03-10 12:44:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 25339e04da836f0552ccdd10eab80d56 SHA-1: 20a0f260358ae07bd3b06799e3467171151027f0 SHA-256: 1b8c7eba9181447323565c881326ecbd192653b2a6c0da51bca84cd984676619
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 a machine learning classifier. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain keywords related to Dell Optiplex specifications, likely as a lure to disguise the malicious links. No scripts were extracted, but the presence of malicious links strongly suggests a phishing or redirection attack.

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
  • 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://dafemum.ru/strik?utm_term=dell+optiplex+9020+core+i7+specifications In PDF document text
    • http://on24-system.club/airthereal_ma10k-_pro_user_manualzeslk.pdfIn PDF document text
    • http://jetavof.sportsontheweb.net/samsung_scx_4623f_scanner_driver_download_for_windows_7.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/closest_paintball_store_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/kataregulu/eVPw8ec/xatoraxabizavub.pdfIn PDF document text
    • http://todayit.pro/19864105797mrfut.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/55946095885.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/77084967896.pdfIn PDF document text
    • http://procripton.com/9525755665600ycd.pdfIn PDF document text
    • http://bizelapeto.iblogger.org/gaximerusepali.pdfIn PDF document text
    • https://cdn.sqhk.co/rebiguta/jdau3jg/wejetekowavepurijivo.pdfIn PDF document text
    • https://cdn.sqhk.co/jalinutaxos/cjaidij/vekoxoviberezazerekivun.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/jd4jglL/itranslate_translator_dictionary_5._2._9_promo.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/wumodukubaru/how_to_setup_d-link_dir-825.pdfIn PDF document text
    • http://dogamesesokuj.rf.gd/bromine_dioxide_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0433ef07-716e-4081-a809-27fa65583a88/www.perfect-english-grammar.com_present_simple.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6728b53e-d0fb-4956-884a-ebbbbfc80a28/ripaletujajamubesemugufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff58fff5-32fc-431e-9c76-7fd3cdb5403c/fatanolevakejalogugat.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/zuwuwusukisa.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/8676652177.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/70389505826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ddc2d0b-e9c0-49b0-8142-730d9d031e47/refekesidobabiwufepiraz.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_off0000eb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 5588 bytes
SHA-256: 0e1b3dba2bf56774d213ceeda2c6bffed9cf1228d752dc43adc014a3b23329d3
font_01_sfnt_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 11368 bytes
SHA-256: 4063486f3c8683a4fad62fcf80f4c5c8394af6a5a59d18303593653443656946

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