Malicious PDF — malware analysis report

Static analysis result for SHA-256 70261a8a6243fd8c…

MALICIOUS

PDF

74.5 KB Created: 2020-11-29 15:46:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8fe86dea2c2a1404bc28af83d37f1988 SHA-1: e549ed4044265172d1d2531ed0024ce1c7ebe3f2 SHA-256: 70261a8a6243fd8cac479020c0164a487ec9d88fd70845e35e5ad5987e725976
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a high-confidence ML classification. It contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or redirection scheme. The presence of embedded URLs and the overall structure indicate an attempt to lure users to malicious sites.

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
  • 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://traffmen.ru/123?utm_term=i+love+to+tell+the+story+history In PDF document text
    • https://luzofimufabo.weebly.com/uploads/1/3/4/5/134590143/8101177.pdfIn PDF document text
    • https://dilopapavi.weebly.com/uploads/1/3/4/7/134705518/latalibedefeka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407994/normal_5f9262be65be2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_5fa7f9dcb8623.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/dazutun/vanillite_pokedex_information.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/zamulunemexixa.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/pathfinder_kingmaker_classes_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e56cfb-026d-410b-84b9-eb9bb06a68fb/42242319890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73c4a9f5-57b7-4f03-9122-83048f2974d6/4747489622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54625680-8ef2-490c-a5f3-c83cf5a255cb/4750404515.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/crbsi_latest_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e60612c3-35f8-4e18-a323-5a4cc3c2fadb/44396212480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1004b0-af3b-40b3-919b-f3d4526b7015/noclip_roblox_script_free.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/74672312939.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/probability_tree_independent_events_worksheet.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_off0000e82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82C 4664 bytes
SHA-256: 92e82a2733672759d299f55972b8efdbbbbfe303a1985f949b25593edfdc4d10
font_01_sfnt_off0000f80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 10712 bytes
SHA-256: 7c74e659a1ca3bff73b9b9f535c00af39a3a280244ae13d892296a85afed3b92

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