Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd56dce67aef88a…

MALICIOUS

PDF

77.2 KB Created: 2020-11-25 05:05:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c4db81c32c94ec7e94adf9e2a3828ea4 SHA-1: 928c3ddfe709e50b4702aa75287541329f8ecb4c SHA-256: 5cd56dce67aef88ad08ff4ab209eea583b7af016cbe0ef00778d9bfc3ee64a63
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL that appears to be part of a link farm designed to manipulate search engine results. The ML classifier and ClamAV detections strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive content.

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://trafftec.ru/123?utm_term=7.3+stoichiometry+webquest+answer+key PDF link annotation
    • https://xataramev.weebly.com/uploads/1/3/4/3/134320843/fewuwefuvufu.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/4b8831fe-3ed1-4845-9307-8bffc8f276f9/windows_8_free_download_iso_32_bit_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/vozivajiroruduwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d70fe9e0-cba4-4369-938e-67d4b885c638/chistes_cortos_para_alegrar_el_dia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/150e0180-55b7-453b-b456-886af690def7/shinestar_sata_4_port_card_drivers_download.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/android_studio_export_apk_for_google_play.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/pabifukogowabosubuwewat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/636c606c-0d9c-4cbb-acfe-c61df0d068bd/zedenotuxesus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e41b0579-9efe-4f78-bc1d-7cdc3ac0264b/fit_to_rule_eso.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/benefits_of_free_trade_agreements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a32edb-d481-4a45-b353-ea9735c9f682/juwos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d051ec53-8661-44b1-99f2-faa94573b887/42029627078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a8900bc-762e-4b6b-9904-0b9d9977707f/lugokozoxavinuseletatame.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_off0000eef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 5712 bytes
SHA-256: dc5d1406d887f6626d31b26e74009a3f07f53b9456f1dbbae9d9b195da15254d
font_01_sfnt_off00010267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10267 10948 bytes
SHA-256: 6e195a3e695220a1f7a84e37e75959676c797705648ddece8b50db4fe446689c

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