Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d03f88c8ba1a024…

MALICIOUS

PDF

72.8 KB Created: 2020-12-25 08:32:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5a36db2774c815443296093b5859cb85 SHA-1: fcbe50795c0fe61682aa9614b5daec85c7eb2156 SHA-256: 4d03f88c8ba1a0247735f4c926d0cd8aa49287146f83d6c833332c53a1ecf38d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a malicious campaign, possibly using embedded JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/wb?keyword=residence%20inn%20atlanta%20norcross/%20peachtree%20corners PDF link annotation
    • https://beretukajawedu.weebly.com/uploads/1/3/4/7/134713042/lizus_garutofekufepe_wivopalosed.pdfIn PDF document text
    • https://vugawijop.weebly.com/uploads/1/3/4/5/134594760/guwuperejezuj.pdfIn PDF document text
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/65a36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453103/normal_5fbcacb92ae73.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/dc751b8c-485b-4bdc-a9cc-daf61a833b49/tubibiwewilixesiramaro.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/sagero.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/bikoxuwap.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/mopuxet.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/77525468936.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/bahut_pyar_karte_song_new_version.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_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 5204 bytes
SHA-256: dc5f8996c54199cb429f12a1a916c8dd4dfd2baae536d524f140bbfbd0760255
font_01_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 11356 bytes
SHA-256: 71450caa472876ab4003c03b1e43f50cb065f8676765106fc22fa70b75dac6c0

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