Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb92bbc7ac193ac…

MALICIOUS

PDF

67.2 KB Created: 2020-11-10 07:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 779be5c1bf7d0aeaa4d8a0b60eceaea8 SHA-1: 56670b86e3d795ce2bca3f5158cd3b8e8685b9ee SHA-256: fdb92bbc7ac193ac8fc0e5e76ce81ff4be618460e537db868711de2825fd974f
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links pointing to external PDF files, a technique often used for SEO manipulation or to redirect users to malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to known malicious redirector infrastructure. While no scripts were extracted, the sheer volume of outbound links and the presence of a malicious redirector suggest a phishing or content-farming attack vector.

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://gettraff.ru/aws?keyword=dugi+guides+addon In PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/jibigamefomoni.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/f71a1c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5f92ec77daf35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473938/normal_5fa8e40d4517f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5f972853235f0.pdfIn PDF document text
    • https://limikasideg.weebly.com/uploads/1/3/4/4/134446439/gurup_gexawa_muruj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405430/normal_5fa2fd5ed2e8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454824/normal_5fa72ffd1c482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_5f91b5fb2a38b.pdfIn PDF document text
    • https://sivipafegedijog.weebly.com/uploads/1/3/4/4/134443607/duvigi_vebilar_kugikekorab_zatejimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426271/normal_5f983fd30402c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416153/normal_5f9c9c2812849.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f875ef3-ce44-4777-aacd-665a8bdfe9c0/69443963004.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_off0000cb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB83 4864 bytes
SHA-256: f9eb206aa8e1191cd8e6803d84714479100dd6201f4a5b8365833e9a8744b6c0
font_01_sfnt_off0000dc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2A 10684 bytes
SHA-256: 88741ea2fbb24de9a472f09a8199061c2b909df2c95fcbe89363c8909d1d589b

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