Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7179eaa468b4193…

MALICIOUS

PDF

65.9 KB Created: 2020-11-25 22:12:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d19b8002e1317db418c3abc26f7233d9 SHA-1: 14b0980a04ccb20e9330835c639f7f5275326b50 SHA-256: b7179eaa468b41937581aaa9fdd7cac423154ae043d55f71ffe7825010182c93
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to potentially malicious redirectors or link farms, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ClamAV detection and ML classifier further support its malicious nature. The embedded URLs are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/strik?utm_term=examples+of+sensory+details+in+the+pit+and+the+pendulum
    • https://cdn-cms.f-static.net/uploads/4391037/normal_5f90f2f1d4a51.pdf
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5f909dddd6f5e.pdf
    • https://cdn-cms.f-static.net/uploads/4376609/normal_5fbe8a5f79de3.pdf
    • https://gaturavokig.weebly.com/uploads/1/3/4/3/134317265/c9755a.pdf
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/bixipepeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/potofaw/openoffice_templates_invoice.pdf
    • https://s3.amazonaws.com/limewub/tepotituvojogudinoripebup.pdf
    • https://s3.amazonaws.com/nowokil/tufasegivibisizam.pdf
    • https://s3.amazonaws.com/juvetaso/restraining_order_nj.pdf
    • https://s3.amazonaws.com/fujadabez/itunes_for_mac_os_x.pdf
    • https://s3.amazonaws.com/giwurode/1-99_crafting_guide_2019_rs3.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_off0000c655.bin
dc4b9e8d5520beb031aa4ab67864e5c47aa92b06a0b0ebafbd6cb8e901badb64
pdf-font-stream PDF embedded font (sfnt) at offset 0xC655 5408 bytes
font_01_sfnt_off0000d89f.bin
159b85c9eb0e692d037d772f117d7918caa702c8d1457b874d4e8027fabdd4ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 9776 bytes