Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49c5351786d1c19…

MALICIOUS

PDF

75.9 KB Created: 2021-03-16 05:02:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0ac496e47c18b67f45d6dd639009748a SHA-1: 958df466c56a9c81ed5efcd66bf5fdc0cc7396f5 SHA-256: a49c5351786d1c19011b84b70f6674dbccd6fc9fd88561cc3b973034b06e16c3
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 0.9998

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://golowaki.ru/123?utm_term=star+wars+theme+flute+sheet+music PDF link annotation
    • https://cdn.sqhk.co/kimejijomaki/ihjdsRE/free_new_escape_games_032.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/cbgchip/axes._io_mod_apk_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/naveropifo/uwihidm/16378754458.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/dhghaij/yeezy_350_v2_carbon_sizing.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/Ry72ieN/saber_el_saldo_de_mi_tarjeta_visa.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/livivuvuwugeb/chaffle_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/bolshoi_theater_guided_tour.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/dante_alighieri_inferno_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/ssrs_report_builder_iif_null.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/wasabibapawikekaxisa.pdfIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_8e7475c8d29a43c29d59f147d05ce983.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/741410e0-2696-4f90-b8e1-b844a9a3d9de/52589132275.pdfIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_c2111cd3c129481b9adc225c5bbceea4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/efe09c3f-b6d3-4933-9be6-54526e817707/bokurometop.pdfIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_b965483b6a48469984da3aea5682f57c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/simujix/58818620718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4004c76d-22c9-4bab-a218-0dff295fdb53/takorivejeniru.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/sivonita.pdfIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_5b64ec2a193442fca20d8ee58fd35f02.pdf?index=trueIn 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_off0000e959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 5316 bytes
SHA-256: b5470d39405247976662f288f93cf12c7ffa03702f665eb3b92035f743106d72
font_01_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 10964 bytes
SHA-256: beda392898b7698df93e4b055176f71760da12cb2697da796bb4f1296b020a37

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