Malicious PDF — malware analysis report

Static analysis result for SHA-256 603d8ba5eb5917e1…

MALICIOUS

PDF

83.3 KB Created: 2020-11-26 13:40:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2699f82fbc35a33e1786ae7fbcb17fdb SHA-1: 1cb54c57f4e8336a2349e4e009b1047cc783f6bf SHA-256: 603d8ba5eb5917e1cb4463c1a341173a75ed05a57ce635964595b5a8188c476f
214 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 external links, many of which point to PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a potential phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=skyrim+maven+black+briar+kill In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450048/normal_5fad818380305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383807/normal_5f955d6b52290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_5f94f51e3427e.pdfIn PDF document text
    • https://gedolumu.weebly.com/uploads/1/3/4/7/134761272/jukulapesewujexu.pdfIn PDF document text
    • https://weropejo.weebly.com/uploads/1/3/4/3/134321986/bitigokurifozikurek.pdfIn PDF document text
    • https://xexalidifiso.weebly.com/uploads/1/3/4/6/134685587/b664aebe67cafd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422645/normal_5fbe7f0dd630c.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/9663682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5f8ccdf8eede3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391649/normal_5fbadb9608237.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/sinamozagemoger/84377662224.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_off0001081a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 5236 bytes
SHA-256: d094dcc603718f04e8fefb51da712ec363bdc885205ae3d48930e6ae1f107986
font_01_sfnt_off000119e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E6 11876 bytes
SHA-256: bd2da8115952520af8c858857f5703edf3ac53eeef0695b3c45cec9b3c6c941f

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