Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b9739bf5dee180…

MALICIOUS

PDF

84.7 KB Created: 2020-12-23 02:08:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6d38381849eafe0f355c7fb4c7665e20 SHA-1: 9e9dd03cd60be9c9e2f689c0fe17811e1de3a469 SHA-256: c8b9739bf5dee1806d173fea72fa7d2ee6be1a4928752f7b8318a13a0da29eda
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The heuristic firings indicate the document is designed to link to a large number of external PDFs, potentially for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=in+season+hockey+training+program+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408589/normal_5fd2a38784523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497658/normal_5fdc2cba62867.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/wulujetari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5f8b90e8e1de9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450048/normal_5fad81ae9fe9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452157/normal_5faa35cfad1e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_5f95d46aabe64.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/litunux/android_messenger_autocorrect.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/nanozupidubizawagasefun.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/ms_word_cd_booklet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/autosketch_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/animales_en_peligro_de_extincion_en_puerto_rico_murcielago_rojo.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_off00011023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 5640 bytes
SHA-256: 58a602cca9be8a17577293a1f058ebb6b79039b4f51f92dcac1c8c6565168130
font_01_sfnt_off00012332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12332 10304 bytes
SHA-256: 646a4aecd0faff39e4c6f6bc63c0001a5b2eadf8e3534afbebfacaacc314b036

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