Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4e4b8e07934a9d…

MALICIOUS

PDF

83.5 KB Created: 2021-02-19 16:02:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3de9ed92fb42d3b3244ad57839c12a00 SHA-1: 9086d18dd0b54bc504c328d317f73463651e3310 SHA-256: de4e4b8e07934a9d3dca0274ddafe65af7e12a02c91e78b63c7411fb7df1d19f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets, which is characteristic of link farms used for SEO poisoning or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://maypoin.ru/123?utm_term=how+to+add+images+to+design+space PDF link annotation
    • https://vuminuzatadabem.weebly.com/uploads/1/3/4/3/134311796/renanipefuvusajumiju.pdfIn PDF document text
    • http://bunakevogipo.iblogger.org/transformar_en_caricatura_una_foto_online.pdfIn PDF document text
    • http://jezewujedufeg.iblogger.org/84483367720.pdfIn PDF document text
    • https://xowozasa.weebly.com/uploads/1/3/3/9/133999953/513bdcfc2a44.pdfIn PDF document text
    • http://gilelugojes.iblogger.org/12645086809.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/muvojugejoxip/glamor_bard_guide_5e.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/navevu.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/how_to_storyline_360_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/18680870627.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/verizon_fios_tv_guide_fredericksburg_va.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/ahirani_comedy_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/55076884654.pdfIn PDF document text
    • http://palomidifigur.epizy.com/41049375346.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_off00010cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF8 5320 bytes
SHA-256: ad4035e61606b9d52b0cd715089f1ae09affbbb3d9c49b07ef9846e05560d22e
font_01_sfnt_off00011f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F17 9984 bytes
SHA-256: cc5df4f2e83bcd0246768f078074a0a0d5cb8eda945b40e2fd615fb571d4b239

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