Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5bdb451b4a50137…

MALICIOUS

PDF

75.7 KB Created: 2021-02-22 21:18:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e745bc8079e96fa083674c6d4444ea5f SHA-1: ccde923c5c303f7193d6e0a4b5da4a5342005dec SHA-256: d5bdb451b4a50137cfefad78024fe8a762bfd41c7a27eacdf834e23e5db16f48
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though partially obfuscated, contains text related to loan interest payments, suggesting a lure. The presence of numerous external URIs, including one pointing to 'baarspo.ru', strongly suggests this PDF is designed to redirect users to malicious websites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL heuristics point to a phishing or downloader attack.

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
  • 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/123?utm_term=how+to+calculate+interest+payments+on+a+loan PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444098/normal_5fe3692275deb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_5fe856c3dc0fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459937/normal_6003a500080b5.pdfIn PDF document text
    • https://cdn.sqhk.co/bufomofa/hi6hfw5/91317536216.pdfIn PDF document text
    • http://immortal-sho.club/11165877584jzrky.pdfIn PDF document text
    • http://f1l3download.site/mozutagugojizp66tl.pdfIn PDF document text
    • https://gumikixinugud.weebly.com/uploads/1/3/4/8/134864359/124bff74e7b4.pdfIn PDF document text
    • http://narewenu.22web.org/90130514715.pdfIn PDF document text
    • http://piwakere.iblogger.org/beautiful_quotes_in_tamil_with_images.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kujavuven.epizy.com/tascam_model_12_release_date.pdfIn PDF document text
    • http://mulazukaga.rf.gd/vusovotatat.pdfIn PDF document text
    • http://vizulubafaxal.epizy.com/erosion_and_deposition_by_glaciers_answer_key.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_off0000e9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 5232 bytes
SHA-256: f8b5981043d92844667614402b5f115474d1e1622621c002cc37e2e93725ea1e
font_01_sfnt_off0000fb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 11148 bytes
SHA-256: c9d3ef3b70754aa2718521bef39a177ea32eade8ada82dc7d8b0587690ffaa11

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