Malicious PDF — malware analysis report

Static analysis result for SHA-256 206823cc9fa5db1a…

MALICIOUS

PDF

71.3 KB Created: 2020-11-25 01:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f89f29c9d2bc97aff00cc84997079474 SHA-1: 2c5bdf0643f228d3abac053eabfeb5b6087d3c66 SHA-256: 206823cc9fa5db1aabfa70810c8d5b3adc9cffdeed843d64d22876d21455805d
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file exhibits malicious characteristics, including links to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm for SEO manipulation or malware distribution. The presence of a critical ClamAV detection and a high ML score further support its malicious nature. The document body, though heavily obfuscated, contains references to 'Androrat binder apk download', indicating a potential lure for users to download and execute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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=androrat+binder+apk+download+for+android In PDF document text
    • https://jilukixewe.weebly.com/uploads/1/3/4/0/134042659/0e8d755dcf.pdfIn PDF document text
    • https://naketutetan.weebly.com/uploads/1/3/4/6/134660231/9508311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444853/normal_5fb8b8c315af9.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/vigevot/97837790344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83f80bb0-2c40-4367-983f-3a589d4f67ef/fikek.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/expanding_3_brackets_corbettmaths_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1f1bfb-201d-4f27-bd07-aa1556888934/16049779575.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/ashrae_handbook_heating_ventilating_and_air-_conditioning_applications.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/fiori_design_guidelines_overview_page.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/basics_of_biopsychology_pinel.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/simple_loan_promissory_note_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22b265b8-4173-4285-aab1-52be29d82d7a/88480959507.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/pandora_s_arena_how_to_beat.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_off0000d19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19E 5140 bytes
SHA-256: 39f6ad43b02ecacd1059d9cd4968c5b24771fed01f9cbce986e2d05ee73627f2
font_01_sfnt_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 10620 bytes
SHA-256: 743e0de5521aa6e3dc363f978737eac423d0237d1ab392616c19ad78bf7e6350

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