Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a735aab1f31ee2…

MALICIOUS

PDF

66.4 KB Created: 2020-12-18 10:54:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 44b4f2410112cf7e1792a8e9c90230c7 SHA-1: b1e287d549ada4e1b288fdf245facffbfd37ab69 SHA-256: 52a735aab1f31ee2f885aac1c5ee02e20371759db20687ceca5deca308f8c181
244 Risk Score
Tags
free-cdn-ebook-manual-lure

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 disposable domains and redirector services, indicating a link farm designed for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://gettraff.ru/strik?utm_term=how+to+write+a+self+help+book+in+30+days In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_5fd2303c793f8.pdfIn PDF document text
    • https://ronizizuvuf.weebly.com/uploads/1/3/4/7/134707383/kipuw-wolaledefix-xapenodiweki.pdfIn PDF document text
    • https://lunotoxo.weebly.com/uploads/1/3/4/7/134760069/1991967.pdfIn PDF document text
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/lediloluvurivo.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/8347111.pdfIn PDF document text
    • https://sonefuvik.weebly.com/uploads/1/3/4/3/134325549/d60f837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_5f9a08b1f0ff6.pdfIn PDF document text
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/9359301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490116/normal_5fb4a1e4c77ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbfd6e2c6d96458361c2338/t/5fc234289b1ed035382574c6/1606562856520/celula_procariota_organelos.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc37900ec917750a3e8073f/t/5fcf390ecd9a2056ff71d58a/1607416078805/21844139419.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5073312facd59cec7706f/t/5fcced7805ddc9599d2289cc/1607265657467/69249279823.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_off0000c687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC687 5796 bytes
SHA-256: acde2d8e423614be06b1b7c4df3f8a2e594e1fe3e56b547db5568ba5338a5264
font_01_sfnt_off0000da47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA47 10300 bytes
SHA-256: cbf5322d5c18161db8b00e0127df0b466deb62294e64728180f0d6740e8df055

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