Malicious PDF — malware analysis report

Static analysis result for SHA-256 4883c9517beb6dee…

MALICIOUS

PDF

84.9 KB Created: 2020-12-17 11:23:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 40b051e45bfe7aa63e76f9b3cec5a547 SHA-1: d189afea87f6fd0752dd6a24516559f1a781505f SHA-256: 4883c9517beb6dee2093ca39788eb16f71cab5b04483a9b3e2d0925e6c7e2a6e
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. This suggests the document is part of a link farm or phishing campaign designed to direct users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://traffine.ru/strik?utm_term=aveeno+positively+radiant+cc+cream+fair+to+light In PDF document text
    • https://cdn-cms.f-static.net/uploads/4502268/normal_5fd8eb44cccfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482870/normal_5fb2e9078b33b.pdfIn PDF document text
    • https://wovasemuzusalej.weebly.com/uploads/1/3/1/6/131636629/giradadiniw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416151/normal_5f981f6c962a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387821/normal_5f93076ac1a6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_5fb6dd504f7c8.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/norozovijalu/bilizunupabaxaz.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/88203552240.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/79472191320.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/acronis_wd_edition_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 11284 bytes
SHA-256: 228dd8ee8bef724646ad33e68b3ca133466459a37b9008b7781b74776c42c2b2
font_01_sfnt_off0000ffd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD6 5720 bytes
SHA-256: 949731ff3c135273b9315232cc3f7725f3358e2b1ea591e6691a32b69d9ccaff
font_02_sfnt_off00011334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11334 16524 bytes
SHA-256: 43d0fe2f559f05000445338373c259da0ecbbfd6cb98c6473c6ff50889586497

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