Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f09cf7a17351381…

MALICIOUS

PDF

79.7 KB Created: 2021-03-03 13:08:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7a1b044b5251759a1ca02ee600d70afd SHA-1: 73a634d94173d6f5b6561973d00efb022205b909 SHA-256: 2f09cf7a1735138182f42536d32bf8cc81a091717558eeb9604947fcf73536ef
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm or SEO spam operation. The heuristic firings confirm the presence of malicious redirector links and a link farm, with one URL specifically identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

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://yafferge.ru/award?keyword=rowenta+focus+excel+iron+reviews In PDF document text
    • https://zodekunomaxuj.weebly.com/uploads/1/3/0/7/130739112/xofebuwotimusitovexo.pdfIn PDF document text
    • https://cdn.sqhk.co/letojeka/F05WPja/8512536975.pdfIn PDF document text
    • https://zojezuma.weebly.com/uploads/1/3/1/3/131382028/3e1146.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/bggCnhi/tnt_mods_for_minecraft_apk.pdfIn PDF document text
    • https://rawadawopi.weebly.com/uploads/1/3/0/8/130874142/ae13f18.pdfIn PDF document text
    • https://kiwitelovig.weebly.com/uploads/1/3/4/3/134358902/4397226.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/heggiiX/zefesexuna.pdfIn PDF document text
    • https://motovonesavot.weebly.com/uploads/1/3/4/6/134690882/xekewozoxikizozuf.pdfIn PDF document text
    • https://mutabezikubi.weebly.com/uploads/1/3/4/7/134739743/6069b6eaa78b068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_6030fb1114ef3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497082/normal_5fe2933b81ac5.pdfIn PDF document text
    • https://fanakigefepawaf.weebly.com/uploads/1/3/0/8/130873796/ea946c6f.pdfIn PDF document text
    • https://xesuxikoju.weebly.com/uploads/1/3/4/0/134095833/pivuxofusot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489251/normal_5fec74f2cf245.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460263/normal_5fe5e145714eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374178/normal_5ff5838b28aff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425491/normal_5ff9f3963bd6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481173/normal_602d5f7820756.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_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 5100 bytes
SHA-256: 36029ee9e6868defa7fe0b0571430bb063aaded84f99c340144a156baed64c53
font_01_sfnt_off00010113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 14892 bytes
SHA-256: f6b86e4a30e0abbb6a909390b731516cebc93faf7cab247827130c23d186be46

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