Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50d59134b3b7fac…

MALICIOUS

PDF

350.6 KB Created: 2021-03-01 03:10:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7f9c7e75087d59358142557d4fc3f297 SHA-1: 27e09fa2f7b303b3cd19d8eb6fbdcc4d2dfe97b7 SHA-256: e50d59134b3b7fac23f6e5178c4520a01dea9e8211a4b14d5d61a3a2770de5e5
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik?utm_term=totally+incorrect+volume+2+pdf'. This, combined with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. No scripts were extracted, but the presence of a malicious URL is sufficient to classify this as a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9858

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=totally+incorrect+volume+2+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4406482/normal_5fcd3af640f0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475212/normal_60230c7e23e6f.pdfIn PDF document text
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/lopujebufetese-vewikumubuxul-dekifexu.pdfIn PDF document text
    • http://anyita.space/gawivakerakurimejav7knma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476590/normal_602d9fe52132d.pdfIn PDF document text
    • http://prizinsta24.online/9352405976370eke.pdfIn PDF document text
    • http://revershjtb.site/bitcoin_for_dummies_freeyu5o7.pdfIn PDF document text
    • https://gurawibozogudex.weebly.com/uploads/1/3/0/7/130739732/4292316.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475572/normal_5fcce0cada629.pdfIn PDF document text
    • https://gataforebulor.weebly.com/uploads/1/3/4/3/134337884/kizujewoniw.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/xafaxotaful/27724489888.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/east_of_eden_book_vs_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/vemikokes.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/17659250513.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/37109722003.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00053124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53124 5364 bytes
SHA-256: 127b53cfcc4763b6a7df4738cfa435cf7eea9ece3aba937b2443766c6f6d178c
font_01_sfnt_off00054363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54363 11780 bytes
SHA-256: 457d63d94b0e27cbb8a2ac9e4e6728b0ff7e887d6c9d29407486989ad677ae4f

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