Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16ce18ccdd4ef82…

MALICIOUS

PDF

69.6 KB Created: 2020-11-26 03:25:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b8d54a5b86b8a4ff4661dae5393c23c1 SHA-1: 334a537909a534cd558da813919ca22e6482d5a5 SHA-256: b16ce18ccdd4ef8223d4c5b1bd82c3ba04d4a0975d6d7a233a954fff190a39fe
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for a link farm, directing users to a URL that appears to be a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious 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://trafficel.ru/123?utm_term=pokemon+battle+text+generator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387703/normal_5f9127cbed5d6.pdfIn PDF document text
    • https://tovigaxibikufa.weebly.com/uploads/1/3/4/8/134875165/pulesoxurigavod_jesisebujulo_mevaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467325/normal_5fa9cb1758ddf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tetazino/gallatin_county_clerk_and_recorder_bozeman_mt.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/brahmacharya_yoga.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/46136749573.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/bivojipadatedupajubijedam.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/paises_del_mundo_y_sus_capitales.pdfIn PDF document text
    • https://s3.amazonaws.com/lojigevaxive/10086735199.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/vaxakivuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/717c2296-b3f3-4cbe-a611-86de4da87b88/87057232493.pdfIn PDF document text
    • https://s3.amazonaws.com/pojojagajevuxa/motorcycle_games_unblocked_77.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/paxufefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d36314ae-6540-4815-b4e0-0f2f2895f0b6/63512824305.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/xitarasopobemunorupab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC494 4840 bytes
SHA-256: 34879c425c88a9451af5f1b7f6e224ec2cfcf71dac97776ac4155ca46812864d
font_01_sfnt_off0000d4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 11088 bytes
SHA-256: ed7b267791807c43a17c33a803e1e26452f24d9fc45f8bc0a4f7bb16ea77b4d9
font_02_sfnt_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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