Malicious PDF — malware analysis report

Static analysis result for SHA-256 6552b7945516f5c1…

MALICIOUS

PDF

64.1 KB Created: 2020-11-20 00:34:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 453b62fca4acdd82a21539fcb2affe2e SHA-1: 9c9b5040a7284f8831d3c1702792d2bc8f0a171b SHA-256: 6552b7945516f5c10b1e1820ff50a52499e3353f5a58c2fcc54f6f610092e66c
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' suggest the document is designed to redirect users to harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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?utm_term=cengage+unlimited+chegg
    • https://cdn-cms.f-static.net/uploads/4375909/normal_5fb01d4c567e2.pdf
    • https://puwexisafiza.weebly.com/uploads/1/3/4/5/134586360/9363695.pdf
    • https://cdn-cms.f-static.net/uploads/4388413/normal_5fa471d174ba1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3ac279d1-61e9-407e-ab16-39dfbef75be0/99064189858.pdf
    • https://uploads.strikinglycdn.com/files/6a8a683a-9bcd-4876-a01a-87e34c984088/bemivazixufazarawaz.pdf
    • https://uploads.strikinglycdn.com/files/9a9acab5-924d-46bc-a97e-058c65b4c8f9/tolugumamulunozav.pdf
    • https://uploads.strikinglycdn.com/files/3feaecb6-8d27-4e5e-912f-f72a32b2334e/12942456040.pdf
    • https://s3.amazonaws.com/xukirizugukugi/nagudomilope.pdf
    • https://uploads.strikinglycdn.com/files/a54c88c0-7892-41d8-a520-5edd550f4694/easy_recovery_essentials_windows_10.pdf
    • https://s3.amazonaws.com/pasawexawinogad/baywatch_2017_parents_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be27.bin
0452ec2b0c9fb6e30191e58a5175b67a83ee7fcaa0a00ff8589d5520ac066e86
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE27 4984 bytes
font_01_sfnt_off0000cef1.bin
118667a9002a74b15cb44df187a54b16e9caad9e4aaf05df7fb497dfdcdf1fe8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF1 10488 bytes