Malicious PDF — malware analysis report

Static analysis result for SHA-256 762ad8d2f8d8142f…

MALICIOUS

PDF

76.5 KB Created: 2021-02-20 20:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 20ab8907f6f8dc98397935b46dc9616c SHA-1: d9f4c94ac6c31fda9a827bce28bf0e45cb0ba170 SHA-256: 762ad8d2f8d8142f8cedf6ebc13671b3a9b2e7b0309803afb2c77e360a36828c
154 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The primary attack pattern involves directing the user to external URLs, likely for phishing or to download further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://yafferge.ru/strik?utm_term=bose+wave+radio+awr1+1w+display+dim In PDF document text
    • http://yesnutural.space/77259237064ytpvy.pdfIn PDF document text
    • https://cdn.sqhk.co/xebibugekux/enheZjd/skullgirls_fighting_rpg_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369926/normal_5ffa0fd9a4bd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387230/normal_60205721d3f36.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/dhhifxY/fever_basketball_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461766/normal_5fc9d6ee120a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491725/normal_6019c2f406170.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/difijgc/cheat_flip_diving_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/BmLgfjc/33752741810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403683/normal_5fe7b1bf28601.pdfIn PDF document text
    • http://mifvideo.space/giwogudabutolimunux5qq11.pdfIn PDF document text
    • https://cdn.sqhk.co/vurikede/iHJ2gdA/74380537175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_601f11aa7f7bc.pdfIn PDF document text
    • https://cdn.sqhk.co/lipebefaje/jihaicF/hollywood_box_office_collection_wiki_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451049/normal_5ffe274837641.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472188/normal_6007ab21ee9ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379603/normal_5fecc39e4ec80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_60188a06bea15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88D 5460 bytes
SHA-256: 067b66358501695a40c89643e15e0ac677be83d5d678235c477979560701e5c7
font_01_sfnt_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 12664 bytes
SHA-256: d6e7bd5941426b07bb4308affddf659a1d132c7ca31f4bfa30360e977640ba25

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