Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf5b0a217c32068…

MALICIOUS

PDF

68.9 KB Created: 2020-11-11 18:55:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 69752bbf1c204f528a7519c9fa3b5de3 SHA-1: 5b66c2e896047ae6b983b3ea43a5b559a5dd3507 SHA-256: 2cf5b0a217c320682f59c317d708a337c33d8bb4cf5247755d1b5b78f15a77fe
214 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, with at least one identified as a malicious redirector. The heuristic firings indicate it is designed to link to a large number of external PDFs, likely as part of a link farm or SEO manipulation to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=academic+word+list+pdf+with+meaning In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408323/normal_5f951fbf4db5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393486/normal_5fa7280ce2914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5f8dd593d37c8.pdfIn PDF document text
    • https://rusokupos.weebly.com/uploads/1/3/4/4/134468665/mizuwibifidum_vixap_kulidolajomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5f9197516b8c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409256/normal_5f97b6905e797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f9b1ee4e0e37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/62404601-44a7-4251-b31f-eabd82126ff6/ragavedefijapapumowokomus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25824b97-79e2-4288-b08b-12ed83dc636b/maytag_dishwasher_mdb7749sbm2_wont_start.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_off0000d147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD147 5652 bytes
SHA-256: d6203a96d78d115a1157cb0d8b6cd5688d23c77e35753bec55902c9490f5422e
font_01_sfnt_off0000e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 10304 bytes
SHA-256: 3d6855694469092f821f0f3b69772649a8d9ea1085ff1dcd5701575d1a932808

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