Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e25871dfdf9b9f…

MALICIOUS

PDF

70.6 KB Created: 2021-02-26 04:49:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6d727fd18eea4c1856225610f44d8697 SHA-1: 1a3fb27acabbab3001d95076a638027aeb62cbc8 SHA-256: 70e25871dfdf9b9fd48e1dbff7f1b8b7599ffeb3e18f92ad7b379ca5fab6cc96
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing. The document body, though heavily obfuscated, contains text related to academic answers, likely a lure to disguise the malicious intent.

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://bologen.ru/strik?utm_term=practice+masters+level+b+2.2+properties+of+exponents+answers PDF link annotation
    • https://faruroju.weebly.com/uploads/1/3/5/9/135986438/7b81b.pdfIn PDF document text
    • http://kudopifupelixi.22web.org/38650600648.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/hbKjbRa/masowutefojo.pdfIn PDF document text
    • http://pe50off.info/what_is_non_commissioned_officer_in_indian_armyqjxoc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447912/normal_5fcde17ca1cf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_5fd628ec6b42c.pdfIn PDF document text
    • https://buvikibera.weebly.com/uploads/1/3/1/4/131453013/2752027.pdfIn PDF document text
    • https://loxigiberojawi.weebly.com/uploads/1/3/4/7/134770663/lofukosurofumaliz.pdfIn PDF document text
    • http://help-verification.com/lerijev2eco2.pdfIn PDF document text
    • https://sopogokatoluj.weebly.com/uploads/1/3/1/0/131071191/medom-wezisanisa.pdfIn PDF document text
    • http://fimosabu.iblogger.org/46755559868.pdfIn PDF document text
    • http://mavurelaro.22web.org/xemozisadurejalubelo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tobavukopipe.epizy.com/guideline_y_khoa_l_g.pdfIn PDF document text
    • http://zavujosabojid.rf.gd/galaxy_buds_spec_sheet.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_off0000d26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26D 5688 bytes
SHA-256: abafb68ec693488116ea4b338966b47f5c69b1764d4dc9bae3e30d47a443c0d0
font_01_sfnt_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 11244 bytes
SHA-256: dd48acdc773b4faed1e19f15a2566cb214eb7e9ce0e1ab655915e00357ed4084

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