Malicious PDF — malware analysis report

Static analysis result for SHA-256 752a406ca5abce6f…

MALICIOUS

PDF

84.4 KB Created: 2021-03-14 03:09:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ed9142e9d9d21208b66e787d9356a4c3 SHA-1: f7da03b5a45e1c9fe3e3eed31ccbb73ecf80c50f SHA-256: 752a406ca5abce6fd10046c038e4f7c02e19a66cbaf9177532151c369d50d0e7
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9996

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://lozipotod.ru/123?utm_term=google+sheet+organization+chart PDF link annotation
    • https://cdn.sqhk.co/nafadurip/a7ieif1/31788102057.pdfIn PDF document text
    • https://cdn.sqhk.co/siganewita/hqNHk3S/71668830648.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/gjehhd3/cat_ear_infection_contagious.pdfIn PDF document text
    • https://cdn.sqhk.co/nawiwola/8zhgho3/96881662906.pdfIn PDF document text
    • https://cdn.sqhk.co/nimuxugemu/yagdoQo/carlton_football_club_past_presidents.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/ea6aff09-a9be-40ef-ac51-a904ac9e5f98/miwovirenunosa.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/ill_be_losing_grip_on_you_meaning_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab77e337-82f2-4036-b888-7ab3acbf9464/10570609320.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/43628945342.pdfIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_3620d2b7ddb045178a7f7b5da7aede9b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/37912a6c-5182-426d-a386-82533cd71c5f/statistical_significance_confidence_interval_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/46963545269.pdfIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_26a5882a5e0a45cb8beddf773b4763eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/20032236383.pdfIn PDF document text
    • https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_166cb94d9799469c83f828e8f5aca13f.pdf?index=trueIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_553b19a1c1d3453ebee6c53fe8da779a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/establishing_your_birthrights_ielts_reading_answers.pdfIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_1977b993cd9046c7aad73f5021dfa5a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/flyer_design_templates_free_online.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/58769208057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/203028ed-bab4-480c-ab8f-bdc1fb688cb7/occult_america_mitch.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_off00010aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEF 5144 bytes
SHA-256: ec6628db5c12477372cbd48291ea36c3fb2e49524808a721c71f730be92d3451
font_01_sfnt_off00011c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C76 11600 bytes
SHA-256: 43b6097047b6ca9dfb86de25ba2a9e226b07e88e2b45093f1704fa7b5b00a4ad

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