Malicious PDF — malware analysis report

Static analysis result for SHA-256 526bedff55234a1d…

MALICIOUS

PDF

71.0 KB Created: 2021-02-24 19:35:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 136da7bc9c811db9ee2c31d651eaaa1f SHA-1: f40c0ae118bc090234f6a124b4665a4d091cadc1 SHA-256: 526bedff55234a1dab0da8e9f0ca4ee550bde90e8aebbdc9f2f781fcd5c183be
184 Risk Score

Malware Insights

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

The file was identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a PDF redirector and a phishing trojan. It contains numerous embedded URLs, with at least one pointing to known malicious infrastructure. The PDF structure and embedded links suggest an attempt to lure users to external sites for malicious purposes, likely phishing or malware distribution.

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://crophysi.ru/strik?utm_term=inkscape+crop+multiple+layers In PDF document text
    • https://rawiranuxox.weebly.com/uploads/1/3/4/6/134618620/be61c7162.pdfIn PDF document text
    • http://fruitslope.online/kikis_delivery_service_book_english2dduk.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/misbehavior_of_markets.pdfIn PDF document text
    • https://cdn.sqhk.co/pesofesidoke/Yjapggq/94863082387.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/fifty_shades_freed_movie_where_to_watch.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/cfDjXja/51721809292.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/2gfgdP4/piano_tiles_online_free_no_download.pdfIn PDF document text
    • http://taptopbot.com/jeepers_creepers_1_full_movie_downloadg1ejx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wujasulo.epizy.com/29330467489.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/lutodapalewagiworol.pdfIn PDF document text
    • http://dilizefolu.rf.gd/impressum_template_deutsch.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_off0000d8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 5180 bytes
SHA-256: 3fbfb71f6d4c336c087dc8154ab732fcbd560117892d665aa635b7e0348ca930
font_01_sfnt_off0000ea9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 10884 bytes
SHA-256: 5ed7d7407894111bad191b69e07886c448d3b9ffaa2d0c9b7098c131c63ee4c4

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