Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f080778d30fca77…

MALICIOUS

PDF

98.8 KB Created: 2021-02-16 01:22:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c73c750053eaa806a4afd51ad7ea0825 SHA-1: d942805c0121bd8c7e4c6a741176afc1fc125a9c SHA-256: 3f080778d30fca777ecd413cdbf40642a710c64b7cce253db45ec73f5a2a982a
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least two identified as malicious redirectors or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. The document body, though heavily obfuscated, contains text related to a TV show trailer, suggesting a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=tom+clancy%2527s+jack+ryan+season+2+episode+1+trailer In PDF document text
    • http://parhelifrl.space/antivirus_free_for_pc_trial_versionizycd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474176/normal_6008d360b6c19.pdfIn PDF document text
    • http://zoom-omsk.ru/activate_windows_10_offlinex3u1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466675/normal_601602b778be1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489992/normal_5fe32ebe848be.pdfIn PDF document text
    • https://biziremidawa.weebly.com/uploads/1/3/5/3/135397591/parakip_kidituwok_temusalixasixo_mazokeguvut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_5fdc8a2087ae6.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/sar_tech_3_study_guidefrojq.pdfIn PDF document text
    • http://qunit.space/larufawigodenixudigefie0nvh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tinezedu/supezan.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/maths_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/26502434580.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/fiberglass_roofing_sheets_sri_lanka.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/8718076943.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/77744299451.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_off00014773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14773 5628 bytes
SHA-256: 4d2870b360570e163982396e6e85906007f4413332c4b53338795371a63cff23
font_01_sfnt_off00015a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A9D 10372 bytes
SHA-256: 7e0cbedc6fa94a691698d5e9e440dda705273fa9501534b60eae485b80431c33

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