Malicious PDF — malware analysis report

Static analysis result for SHA-256 18594a8d8d628d7b…

MALICIOUS

PDF

69.2 KB Created: 2020-11-18 17:27:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 77ac0b3a9bc8678fe239a0c00d2b28ef SHA-1: 127a64b3651fcbd46f7c2d5ad1eb3f89383242f5 SHA-256: 18594a8d8d628d7baf20b65876568f065d072e2c056871b6bf2c9ada43c20439
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one directing to a known malicious redirector. The heuristic firings indicate this PDF is designed to link to a large number of external PDFs, likely for SEO manipulation or to host phishing content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

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://ggtraff.ru/strik?utm_term=phd+statement+of+purpose+sample+comp In PDF document text
    • https://xulajaxosu.weebly.com/uploads/1/3/4/3/134366267/2919819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5f994e4c851f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391602/normal_5f8e11ab973b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5f87480326616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418188/normal_5faf4382296ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_5f8e19b811f98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_5f875ea07f6a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485926/normal_5fad91a026d0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5fb014be7d0c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425919/normal_5fb40c974d502.pdfIn PDF document text
    • https://dawozonejuveru.weebly.com/uploads/1/3/4/4/134489779/foxexedad-keron.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492892/normal_5fb52164313a2.pdfIn PDF document text
    • https://menelaxewo.weebly.com/uploads/1/3/4/3/134362368/xewaxatajoki_bitikikiwamim_mojaxoj_zonobatumew.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/wizedumi/76950648396.pdfIn PDF document text
    • https://s3.amazonaws.com/kizuporowefib/ski_boot_dryer.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_off0000d24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24A 5396 bytes
SHA-256: 814e2a6ce36ade8f7c17663d0afa689853499f69d2b721af5219c12dc254e086
font_01_sfnt_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 10500 bytes
SHA-256: fa712389e371b3e1574a52d139c8a8e02e6835b52cb442e3e6393e99532a6004

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