Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea0a83dd7716c5d…

MALICIOUS

PDF

77.3 KB Created: 2021-04-01 14:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f26a4e4732c2b319f4da815e1416cc8b SHA-1: 896f8f5be545078568010969780ee9830aa87074 SHA-256: fea0a83dd7716c5d6c7d4d5bf2e24196df3de3eadf9543e6243c155b6976699c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary URL pointing to a domain associated with potentially malicious content. The structure suggests an attempt to manipulate search engine results or distribute further malware through the linked PDFs.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://ponafet.ru/award?keyword=basics+of+sql+for+beginners+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422620/normal_6058db6400640.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421615/normal_602742b8ab0b3.pdfIn PDF document text
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/9978030.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/qXIjfhi/hospital_of_evil_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxevabuvix/bZjhhdT/jumibibotivexezazaju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_600baeb370ad1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_5fe8104d15aba.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/9067751.pdfIn PDF document text
    • https://zewemoledomuro.weebly.com/uploads/1/3/4/7/134746436/pikoseriwuvepu-pemesamexeponi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373986/normal_5ffc9420d2458.pdfIn PDF document text
    • https://fogodaxo.weebly.com/uploads/1/3/4/6/134606017/f5f2ac6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452851/normal_5fe54d6350520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_601616e2dc3bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372378/normal_600468c0b25cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lumixi/mekolutug.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/fiddler_on_the_roof_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/aprilaire_800_humidifier_reviews.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE210 5348 bytes
SHA-256: 63697c74bbf35352dd9528d0624424a90811cf75b46a34c21fc5c18e5167fe7f
font_01_sfnt_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 11124 bytes
SHA-256: 1c85723f5a51fa5151ede0f93956c6a82f74fd9082510edf60333d24d2285a60
font_02_sfnt_off00011a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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