Malicious PDF — malware analysis report

Static analysis result for SHA-256 4786c8a65eae8b1b…

MALICIOUS

PDF

69.9 KB Created: 2020-11-10 17:58:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d9d0e247ca8e2434a723be041295a88b SHA-1: 539b498a2840aa388337cb060eccba743aa1ac8c SHA-256: 4786c8a65eae8b1bf2aff64f447db6013dd3dd47d4d485020c8ac140705e0267
214 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics, including a malicious redirector link and a link farm, indicating a phishing or scam attempt. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous external links, one of which leads to known malicious infrastructure, suggests the document is designed to redirect users to harmful content.

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://cctraff.ru/123?keyword=josef+originals+figurines+ladies In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382620/normal_5f8e506b8b504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_5f92093cd179e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423428/normal_5f9b47c7d0c30.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/2911433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_5f9fb1caa0cc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5f8d901aed79f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385004/normal_5fa2b32267b86.pdfIn PDF document text
    • https://kesazawen.weebly.com/uploads/1/3/4/4/134401730/6333043.pdfIn PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/lefexoserizemojogi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f88452e4c8f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_5f96e7969ff51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402722/normal_5fa3e06057917.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/rimejiguvif/zaxisazipibisepafa.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/castration_of_cattle.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_off0000d2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F0 5064 bytes
SHA-256: 795288028e963a6ae82ad3ebf4647fb39e3d95886114016cb901724471482545
font_01_sfnt_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 11424 bytes
SHA-256: 2b10bbad61087f2a8831d1998db6bd737d2fef83cdb33dfc8349ead37a20d121

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