Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9d98ee0956c09d…

MALICIOUS

PDF

66.6 KB Created: 2020-12-23 00:29:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4613b1b1a1a33ac34fb744e9840833c4 SHA-1: 14345d4e3ee5fbfcaa167eef8303531861b29f0c SHA-256: 5f9d98ee0956c09da5c73048664af6d04c89c30049208fc0f057d8cda9e8a426
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a link farm with numerous external PDF links, including a critical finding of a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain references to marketing terms, suggesting a lure. The presence of embedded URLs and the link farm structure indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/123?utm_term=kiss+me+mascara+amazon In PDF document text
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/luwevomefijed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415080/normal_5fbe52eee58d5.pdfIn PDF document text
    • https://gosasolana.weebly.com/uploads/1/3/4/5/134523876/jajevax-wanozov-rerawutinajubo-dubirulekozi.pdfIn PDF document text
    • https://vivifaxokuz.weebly.com/uploads/1/3/4/5/134511129/wamoj-puxow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_5fa8658f877a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411218/normal_5fe26eaaa7011.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5ada1c89e1c4b8fdf3d5c/t/5fc7ea3f0581dd30a08c050c/1606937152238/amazing_facts_bookstore_dvds_prophecy_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/background_color_app_android_studio.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd35207209c45f74432eae/1606235425773/68629139539.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b6af6879d031da13cbf8/t/5fd6d47e034a586a4f552f33/1607914625633/ferry_ibiza_to_formentera_balearia.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d70dc14dfd36fef128e0/t/5fcd6e7d920f47545ba8453f/1607298686378/mindustry_mods_github_list.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA86F 4932 bytes
SHA-256: b92787876945ced6987f3c87e4919b94e21adb9404df2a8cc5860c56a28c5e0b
font_01_sfnt_off0000b926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB926 10496 bytes
SHA-256: 8eaa382927e5c1d6579fad9e164b1a1fad29625a32dbb7e5a639f4cc51b86a89
font_02_sfnt_off0000db1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 20092 bytes
SHA-256: 9610c6fd0f4b58aa0a9d8662594c153eed34d39b9d67a04c58c6dac5cdb5216c

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