Malicious PDF — malware analysis report

Static analysis result for SHA-256 0321360128beb99b…

MALICIOUS

PDF

61.0 KB Created: 2020-12-19 03:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a000860abfb8c8a5be46776c9cb2899e SHA-1: c49327d4c2c319cdf8ca32328d48439d58f624dd SHA-256: 0321360128beb99b88d40d6df6bb917cc5d1e49521b042e0ff6485859a1f2c9d
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which are designed to appear as legitimate PDF documents but redirect to malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to cctraff.ru, indicating a known malicious redirector. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=physical+science+textbook+8th+grade+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4391624/normal_5fc4e9abd0d37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372086/normal_5fab54261615f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443341/normal_5fb9d5880898d.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/2092f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471688/normal_5fc5a6b27e34b.pdfIn PDF document text
    • https://bijufipenonovo.weebly.com/uploads/1/3/4/5/134529550/aa10d.pdfIn PDF document text
    • https://rulorakaduf.weebly.com/uploads/1/3/4/4/134480735/1240c1503.pdfIn PDF document text
    • https://kexulisil.weebly.com/uploads/1/3/4/7/134762119/vevukarejupufo.pdfIn PDF document text
    • https://satufimitu.weebly.com/uploads/1/3/4/7/134715308/9010859.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/telasebisu/fire_extinguisher_monthly_inspection_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d16953-db93-4056-b830-16f050d28132/95300004225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d280ec17-0d43-4c7c-95b7-18b1c267671b/17109331078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7c411dd-b8e9-4c1d-bd5c-ec66581dcc10/82474836328.pdfIn PDF document text
    • https://s3.amazonaws.com/zukukelejurotef/vutafonopadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eb8b4c8-f158-442e-a8de-d4d40c485485/dolofutadi.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/deactivate_twitter_account_on_android.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_off0000b0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D2 5984 bytes
SHA-256: 33a1bc87d93e5d0a2b5daad9b7eca6d370a36ac4e1e6328b0079275eb64fffb4
font_01_sfnt_off0000c537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC537 9832 bytes
SHA-256: 26eec61899f3b5b5e5b12e6c21252ebb29e0643e30545f81f5da07ddd20c2b42

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