Malicious PDF — malware analysis report

Static analysis result for SHA-256 9128fe38a6ebb88d…

MALICIOUS

PDF

71.0 KB Created: 2021-02-18 14:59:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e54d304ddb9b6c0658a67e3d0fc2520a SHA-1: c992d41441d110ea2518e13a6f7cdeb779bd01b7 SHA-256: 9128fe38a6ebb88d17c1994007371ba9f01e9a9965c2d47e294d87ad17f8fd95
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=what+is+the+modern+concept+of+health+education+explain In PDF document text
    • http://shmelev.pro/resident_evil_2_revelations_cheats38c3u.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/hgdy0gh/miki_falling_balloons.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_6019386e014f5.pdfIn PDF document text
    • http://optalpha.com/runescape_3_fish_extractornqwfs.pdfIn PDF document text
    • http://tixugutag.iblogger.org/canadian_guidelines_hypertension_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374196/normal_5fec72124e8cf.pdfIn PDF document text
    • http://topfrag.rip/fonekoxaruzasilefajutamsuqh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404966/normal_5fe775a232911.pdfIn PDF document text
    • http://thehensleys.org/ynetim_ve_organizasyon9oa5b.pdfIn PDF document text
    • http://train-home.ru/59229524258p9w2j.pdfIn PDF document text
    • http://re-capital.ru/vobekotzl8a.pdfIn PDF document text
    • https://gomafaned.weebly.com/uploads/1/3/5/2/135296522/solokojagoda-situwovuvujudin.pdfIn PDF document text
    • http://makamar.tech/8096366186mt773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393356/normal_6024476aa9948.pdfIn PDF document text
    • https://wejafivikime.weebly.com/uploads/1/3/0/9/130969279/woposew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nulabede.epizy.com/bottle_label_design_software_free.pdfIn PDF document text
    • http://xepalufozakot.epizy.com/juzosa.pdfIn PDF document text
    • http://fopopas.epizy.com/55341379864.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_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 5476 bytes
SHA-256: 01eff2fe1b3fabf7ff9de628230d6e0613c1067b556c28ea6fbec5c06df5a767
font_01_sfnt_off0000ec1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1F 9948 bytes
SHA-256: 548db98edd4ed1a6b2c3ec25bc0a1fe3bc63872cea2615c17d87f14324530d88

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