Malicious PDF — malware analysis report

Static analysis result for SHA-256 963d79dc3a941970…

MALICIOUS

PDF

67.0 KB Created: 2020-11-10 12:16:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1145ed14c6b998a1414b56b174216440 SHA-1: e804343fe4b054aec0fbdd0ebcaa60384b3b2449 SHA-256: 963d79dc3a94197034d4621173944657bd412056292ccc7d2e7830d550a41dad
254 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to checking port status in Windows 10. The presence of a malicious redirector and a large number of external links suggests an attempt to drive traffic to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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?keyword=check+port+status+in+windows+10 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5f88a6a353348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388040/normal_5f9d0fe3c6daa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392472/normal_5f90cbf01a5b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376375/normal_5f8c9b3073c20.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/sugumizaxukok.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/penale/nilino.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/building_ideas_for_minecraft_city.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/rufenulufufusefekor.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/unix_vi_commands_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/44006235772.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/update_ipad_model_md531ll_a_to_ios_12.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/54984843252.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_off0000cad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD5 5384 bytes
SHA-256: bf2f429a03bcd57499fc01a93579505a0b7764a1fe6153fb323095fb9d04fbaa
font_01_sfnt_off0000dd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD30 10124 bytes
SHA-256: 629f0a21ec3ee2d0205eea26dffddc652ed787754d1f7656ad2ff6d24b4ab2e2