Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f643d7e4a2648a…

MALICIOUS

PDF

75.3 KB Created: 2021-03-09 15:15:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d87a34cccded54684b504201136db54f SHA-1: ebaefbb545a5a404ed570f1db52cb9b77fa3753e SHA-256: a8f643d7e4a2648a4a87115c11817b73c1e83d37c0976b8a203bfec0226a523d
156 Risk Score

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 0.9998

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://golowaki.ru/wix?keyword=intersexual+vs+intrasexual PDF link annotation
    • https://cdn.sqhk.co/tixukiko/dheJjja/circular_buffer_meaning_in_computer.pdfIn PDF document text
    • https://cdn.sqhk.co/felolavap/hVhidhf/chronicles_of_crime_app_windows.pdfIn PDF document text
    • http://botefin.medianewsonline.com/nevexinekugi.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/bhdVR5y/hollywood_horror_zombie_movies_list.pdfIn PDF document text
    • https://cdn.sqhk.co/runolisor/jfhfEgh/freeciv_android_review.pdfIn PDF document text
    • http://memimusisat.getenjoyment.net/harley_davidson_6.5_boombox_for_sale.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/kefefetafij/70479884719.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/23288005106.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/html_href_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/xozosulemizedasexijuxivu.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/1030916764.pdfIn PDF document text
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_2ac3368ea9814b279c6957961b885af5.pdf?index=trueIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_0a194b45142848f5bb0310ced1ff7513.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mokixetat/72955712008.pdfIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_a0a0fe94c7ff4b42ac15189e8af26ccf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libosokune/26543659310.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_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 4744 bytes
SHA-256: d82fcd179efc371f6366f3d18d553432f9a347cc7c539ced1330eeeaabca8d87
font_01_sfnt_off0000fda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA4 10184 bytes
SHA-256: bf4f49b1853280dfe3598d83deb9bcd2bfb273083071bd6566b0c83e8eba3ff2

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