Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc341c6fe8715ccd…

MALICIOUS

PDF

69.7 KB Created: 2021-02-21 07:27:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 356de6595927e7cea8efc51bdf5dade2 SHA-1: e1b81db20d0c0f9b4e93b59b3393fd3af8687efb SHA-256: bc341c6fe8715ccdf4c13f3b5247d50980e154116c886a7c20719f779b206728
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/123?utm_term=alfred+piano+books+level+2+pdf+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465389/normal_5fe4efdf023fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448116/normal_5fd771aee3313.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416506/normal_5fe3bcf8bc6c3.pdfIn PDF document text
    • https://bozelisu.weebly.com/uploads/1/3/2/6/132695328/cb14d05.pdfIn PDF document text
    • https://lakafoxure.weebly.com/uploads/1/3/4/2/134266374/1149703.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445534/normal_5ffd98657a9f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489237/normal_6005912e19504.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/libusamagowuvo/ar_aging_report_in_sap_tcode.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/89280234933.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/29707017284.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/cunto_tiempo_se_puede_tener_el_carnet_de_conducir_caducado.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/52320382976.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/vande_mataram_song_in_tamil_lyrics.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_off0000d100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD100 5420 bytes
SHA-256: bf5f4583d72dcac4182ce32171f3c017720466151ac05cf61cf6ec013b13b4ff
font_01_sfnt_off0000e37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37D 11380 bytes
SHA-256: 33de3170fb195a0b2e469c1395b0c3549d927764c5e28a1917e12c801702e18c

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