Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f00167a5132e227…

MALICIOUS

PDF

75.8 KB Created: 2021-01-12 02:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4ca85d1c3912647faa983848a0c1c5bd SHA-1: ed956a3e11b711d0b6e69b860f42be917b114013 SHA-256: 6f00167a5132e2271662fca03476e2f7db8d81124ede48341cfeb878c12a7bfd
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document exhibits characteristics of a malicious redirector and link farm, with numerous embedded URLs pointing to various disposable hosting services. The presence of a known malicious redirector URL and the sheer volume of links suggest an attempt to funnel users towards potentially harmful content. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

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://ggtraff.ru/123?utm_term=test+plan+sample+pdf In PDF document text
    • https://mamapesuwilataj.weebly.com/uploads/1/3/4/8/134857931/fodudulegewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491673/normal_5fd833100ed64.pdfIn PDF document text
    • https://kowenijog.weebly.com/uploads/1/3/4/0/134096242/fabuzagonazen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476938/normal_5fae95c377dba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467306/normal_5fc2c36ca2369.pdfIn PDF document text
    • https://dapifakefigev.weebly.com/uploads/1/3/1/6/131636612/aa0b316.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474218/normal_5fcaea8957dd1.pdfIn PDF document text
    • https://busigejog.weebly.com/uploads/1/3/4/0/134017549/gikoju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375199/normal_5ff659a5bad00.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/siboti_xojomopewu.pdfIn PDF document text
    • https://sazadasixitabe.weebly.com/uploads/1/3/4/4/134404720/a27089003a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487381/normal_5fc6f14ed1be3.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_off0000ed12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED12 5040 bytes
SHA-256: 875756e9f5695ed48ab09c697b931b1e38c1ddd34eafe20504c11c5ee77a858d
font_01_sfnt_off0000fe27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 10648 bytes
SHA-256: cea53e5cff36006d15eef04f9fcd798e9e6774257c747c64a6a1dba1ab3970ec

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