Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa94dba31455eab1…

MALICIOUS

PDF

74.1 KB Created: 2021-02-16 20:35:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 265eeab9f1c3d1c26e5e13bff55a9143 SHA-1: e8b4e17ff33e41a195c943ce630de87cae4f292c SHA-256: aa94dba31455eab1935a4ab40a7a520c1d7ceb12dfab15dfdef0e5b56287ec6c
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier and ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, appears to contain keywords related to trampolines and subsidies, likely used as lures to disguise the malicious intent of directing users to external sites.

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
  • 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://yafferge.ru/strik?utm_term=cheap+14ft+trampoline+with+enclosure In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388596/normal_6010805fed12c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393035/normal_602a1ee9ae5b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485457/normal_5ff4ddb2a6a88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475564/normal_60026ba044939.pdfIn PDF document text
    • https://cdn.sqhk.co/velujuvaxal/bsEnjhU/54231980831.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497685/normal_5fef9070d7f55.pdfIn PDF document text
    • https://cdn.sqhk.co/sufipuxifemo/TikA1bB/9412674673.pdfIn PDF document text
    • https://jimixinig.weebly.com/uploads/1/3/1/1/131164312/3589432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374175/normal_5fd98195242a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379618/normal_5fcaf38510dbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421474/normal_5fd92e5b65de3.pdfIn PDF document text
    • https://cdn.sqhk.co/pixefavenar/e2Mcwig/74170891556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416811/normal_5fd223456b4e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xofududegotu.epizy.com/low_income_subsidy_income_guidelines.pdfIn PDF document text
    • http://reniwen.rf.gd/negaxixiremom.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_off0000e557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE557 5392 bytes
SHA-256: 1f584031090ea18ee2c57c8a2f2e949e530a84a5e02054a29e9e86e4a846f96a
font_01_sfnt_off0000f7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 10572 bytes
SHA-256: 4ce8c6f8b165f9b35481d966dd8b8839728d363c5863292fab1c24f8dbf33109

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