Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c851d23f6e2b7a…

MALICIOUS

PDF

88.3 KB Created: 2021-02-26 16:32:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a355d866629ddc2733ec55ce10814d8c SHA-1: d6e7ecf8a16daffd740e6594eb9935dfa4b59bc6 SHA-256: f4c851d23f6e2b7a4497be3a896a7ba4685f31c2c14205202ae35f6c9f2a8e7e
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a book review, likely to entice users to click the malicious links.

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://yafferge.ru/123?utm_term=adventures+of+sherlock+holmes+book+review In PDF document text
    • http://masajsalonunuz.com/anemia_falciforme_sociedad_espaola_de_pediatria6b35x.pdfIn PDF document text
    • https://roserilufelojow.weebly.com/uploads/1/3/1/8/131856860/5141716.pdfIn PDF document text
    • http://alkostore.xyz/bogelapadexevatagoaitim.pdfIn PDF document text
    • https://zolerowiz.weebly.com/uploads/1/3/4/6/134691656/vemadali-begavej-zegilefakun.pdfIn PDF document text
    • http://pink-echo.club/3650200416294fnd.pdfIn PDF document text
    • https://talaxosukizarom.weebly.com/uploads/1/3/0/7/130775084/judan.pdfIn PDF document text
    • https://cdn.sqhk.co/takoxuwal/6jiid7i/38547685605.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/wotodedaruzuk/3768634269.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/av_player_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/34495154097.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/bupupimutabitu.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/gelipesanusas.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/mangrove_jack_yeast_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/jobim_sheet_music.pdfIn PDF document text
    • http://affiliates.abebooks.com/c/99844/77798/2029?u=http%3A%2FIn 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_off000119ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CA 5396 bytes
SHA-256: 411f3078c988d75c697fdfea0113452b781e5210b15d24ec37ee9a1ac7f2079a
font_01_sfnt_off00012c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C10 11860 bytes
SHA-256: 47346f7d6a8743bbc7f38cec66862a220bdbeaf8c0a85c451ca61d8f8f9c76cf

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