Malicious PDF — malware analysis report

Static analysis result for SHA-256 fafa3d8b6a6b399f…

MALICIOUS

PDF

83.0 KB Created: 2021-01-23 12:59:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6ef54c7b339aa9a57cf209a5f060b3f8 SHA-1: d56f4bee607cf05ed93f37ae179fd452a61d670d SHA-256: fafa3d8b6a6b399fd6e99a02e055b9d165ceb085e670bdba0e68b26c27567424
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 of which point to other PDF files, suggesting a link farm or a method to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=asa+commercial+pilot+oral+exam+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4502833/normal_5fec038698d29.pdfIn PDF document text
    • https://site-1171686.mozfiles.com/files/1171686/wood_statues_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449968/normal_5fc8532b00cec.pdfIn PDF document text
    • https://lanapovo.weebly.com/uploads/1/3/1/4/131437145/631a8f1403.pdfIn PDF document text
    • https://site-1191329.mozfiles.com/files/1191329/shogun_kobe_restaurant_san_diego_ca_92123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383928/normal_5fd9837010f68.pdfIn PDF document text
    • https://site-1184666.mozfiles.com/files/1184666/3104140672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473903/normal_5fd62edd6a1db.pdfIn PDF document text
    • http://gugatem.22web.org/b_c_caste_full_form_in_tamil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470226/normal_600720dc7317d.pdfIn PDF document text
    • https://pinobuni.weebly.com/uploads/1/3/0/9/130969003/2826565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5fd1bb4b1ecdc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408721/normal_5fddc448a5e2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408709/normal_600574e2a1b28.pdfIn PDF document text
    • https://site-1257659.mozfiles.com/files/1257659/51319223275.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412415/normal_5ffe41ca5cefe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000106c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 5452 bytes
SHA-256: f1ab8cd8ecd9476958473afa209be8e1939a503a32f86f6ce447dd3a50143635
font_01_sfnt_off0001193c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193C 11228 bytes
SHA-256: ed5896989fbffc3b942637b0db188a973671f14a251488393d9f24648524dd13

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