Malicious PDF — malware analysis report

Static analysis result for SHA-256 325c6a1d38ee142b…

MALICIOUS

PDF

64.6 KB Created: 2020-12-21 23:03:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 941d1eabaff02ec297486016e1ba7e7f SHA-1: 190c7d2f464d60ff31564b2b3e9e7605a4fba296 SHA-256: 325c6a1d38ee142b3c6f2ed53bec555851b0af695299aaa8840b217560d4ec82
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the ML_NYX_PDF_MALICIOUS score strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to academic content, likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/123?utm_term=fundamental+laboratory+approaches+for+biochemistry+and+biotechnology+second+edition+pdf In PDF document text
    • https://jotukodapoze.weebly.com/uploads/1/3/4/6/134632246/4918364.pdfIn PDF document text
    • https://werovowota.weebly.com/uploads/1/3/4/7/134766705/f8f54765fa93.pdfIn PDF document text
    • https://nigupisotaku.weebly.com/uploads/1/3/4/3/134374455/xotupepigesutekogaki.pdfIn PDF document text
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/situxilowugufipo.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/5fbce344be7cfc36344e8aaf/t/5fbf68dfcb3e0f577147c89b/1606379749115/basivegakeligikudofukewub.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/71902815427.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50598239b0722914bb029/t/5fcbeebd36758319a5620932/1607200445102/download_luxy_poker_online_texas_holdem_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6878d3dd-9457-492e-bb93-e82407b83f86/35203728692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e91c5ee-b454-49a2-8b75-1879321375eb/piralawob.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc559d7df132613bbdb3256/t/5fce39e1662d5e24e0ce3069/1607350754880/classroom_management_philosophy_examples.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd308239b0722912b0841/t/5fc131bbfa04221c714ad9d2/1606496701012/43348924541.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/free_showbox_apk_download.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_off0000bd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD40 5764 bytes
SHA-256: 2f887f4274553914d3d69007d528d5e2e0e4e08147bbbf583709d1f03810189c
font_01_sfnt_off0000d0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BE 10624 bytes
SHA-256: f75ee919c7677870fd6a0c45ead829851ac28370b221fb8c6333e29f10ce9d3e

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