Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9da8e14b3654de…

MALICIOUS

PDF

78.4 KB Created: 2020-12-31 17:25:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6175d6af91a3dbb11b8bf1c212ba6dd8 SHA-1: 689ef61acd0f7b29c5b25a072a1ab724c0b0b546 SHA-256: df9da8e14b3654de60e0eb2f4d6e9c017fac8603089e8dec6e65fc9b3d642524
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a link farm with numerous embedded URLs, one of which, 'https://cctraff.ru/123?utm_term=length+of+string+in+c+plus+plus', is identified as a known malicious redirector. The presence of many external links suggests an attempt to direct users to potentially harmful sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=length+of+string+in+c+plus+plus In PDF document text
    • https://ronizozobofer.weebly.com/uploads/1/3/4/6/134654069/4418265.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/idgemji/snappad_9_inch.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvotalek/CspRbjg/59387387856.pdfIn PDF document text
    • https://cdn.sqhk.co/kipezipilojo/hjge9N4/t_i_sup_multiplayer_racing_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/ledumixifer/HjhdUPK/stacky_wacky_burger_recipe.pdfIn PDF document text
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/xudowerudabuma_tekoguje_revuwajevezujo_fanojawijidobo.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/f6ea0f1b-b3b0-475d-a822-071581f1badd/86443200870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ef5fa38-2e1b-4b9e-8c63-d9207a6d7a84/format_excel_ssp_terbaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b6bbeb6-f072-4f30-8d65-0d641e6106ad/dewugifasevow.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/punjab_government_servant_benevolent_fund_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80cf3c51-9001-40e5-9ee3-cdf095e9c40f/fododegesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70dc6944-4376-44d3-803f-b5c86c94b851/playstation_5_best_buy_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08901f03-7998-4871-bc98-69546475b682/mifuvaxujomegaguri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c22e03f-de01-451a-a4c7-dcb14347cb58/msc_seaside_deck_15_plan.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_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 5008 bytes
SHA-256: a5b0472fd89ccc4e3bfb968234d481fbd57d099055466bbabb520c4f96eda4fb
font_01_sfnt_off00010332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10332 12604 bytes
SHA-256: 646ad1e410a642a936e672949ace063e33ae26e6b6e02850ce5a0daff49a72b6

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