Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cccf5808d03962…

MALICIOUS

PDF

77.2 KB Created: 2021-05-21 04:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0a013d4883595316739e6eb722d6bedf SHA-1: dc2418084f4c2b86cee8691177d4bce3e95e2520 SHA-256: 45cccf5808d039623c6a46062a9e6cb4d18c765f9bda02c80a30eecb557bbf87
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-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://mezovuduw.ru/strik?utm_term=what+is+ancient+indian+history PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459034/normal_5fdc526c09f06.pdfIn PDF document text
    • https://debaduvevuw.weebly.com/uploads/1/3/4/3/134383420/korefofesilewil.pdfIn PDF document text
    • https://jinuvavuvebox.weebly.com/uploads/1/3/4/6/134612635/tapuwavosuzodarira.pdfIn PDF document text
    • https://safusugefivelu.weebly.com/uploads/1/3/4/3/134346528/mudez-pepor-jagosafanu-vivuworenanulok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408596/normal_5feccdb9567db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453906/normal_602c59f0d42c6.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/b9b888ae-12f5-474b-9613-a1404f82ba7e/77948571418.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/income_guidelines_for_medicaid_in_nc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4092243-adc7-4e3d-9e0f-3e32ab9b0ede/how_to_check_gift_card_balance_dunkin_donuts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc253829-ffcc-43bf-9607-72a0e2d4b48c/wheel_horse_tractor_price_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/xabukuleb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13de2c33-6483-4db5-9af1-5e0cad6f1d6b/imaginarium_mountain_pass_train_set_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/sample_rental_agreement_california.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/28343941214.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/does_onenote_integration_with_teams.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/what_was_reflected_in_the_art_of_thailand_and_cambodia.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/24853099763.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/kenmore_350_series_water_softener_grain_capacity.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_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 5108 bytes
SHA-256: 99611aed760b361fe35d562351192b623f05b5e61739015781d5baa929c5d81b
font_01_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 11352 bytes
SHA-256: 08bf90a7f094ac7d66dbbb133aacfbcfaf3a469f3a6da192972b0c10b46ad1bf

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