Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2732bf5d59cbd6…

MALICIOUS

PDF

78.2 KB Created: 2021-02-11 02:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ef0db078a37f916d575a982f3feab860 SHA-1: e6083f3999ba5e0e96e06d410db0782c973a7a34 SHA-256: 4b2732bf5d59cbd66b335d03e763af7aa496e9c91ab168897125da15f71e9f65
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is also detected by ClamAV as a phishing trojan. The document contains a large number of embedded links, many pointing to disposable domains and redirectors, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains text related to installation manuals, likely a lure to encourage users to click the malicious links.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/123?utm_term=blue+ocean+shower+panel+installation+manual In PDF document text
    • https://cdn.sqhk.co/jusitufugaf/chdNGH6/mad_dragon_defense_apk_mod.pdfIn PDF document text
    • http://akmurzina.com/wedijixiwuzenasopxo9v9.pdfIn PDF document text
    • http://jobauthor.online/essence_of_self_realizationq4ddq.pdfIn PDF document text
    • http://strgb2.ru/example_conclusion_for_chemistry_lab_report6eolv.pdfIn PDF document text
    • https://wejolizamu.weebly.com/uploads/1/3/4/7/134766198/0810e4d44c2c4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391001/normal_5fccbab5b543e.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/gifihcJ/screen_recorder_apk_app_download.pdfIn PDF document text
    • https://soberonapi.weebly.com/uploads/1/3/2/6/132681790/1222434.pdfIn PDF document text
    • https://nolizusumebixaz.weebly.com/uploads/1/3/1/4/131438071/1e14303dce.pdfIn PDF document text
    • http://shimano-stradic.ru/vixevovewelomn0l.pdfIn PDF document text
    • https://cdn.sqhk.co/gebijowokobe/cgfhieS/samituja.pdfIn PDF document text
    • http://hookup153.online/bometoguammk0.pdfIn PDF document text
    • https://cdn.sqhk.co/rasadenibe/jcAOjfA/6281080273.pdfIn PDF document text
    • http://klosheff.xyz/kewojebunivebavbrypy.pdfIn PDF document text
    • http://hookup157.online/vipokezinurofufo0mpi6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nidudovuj.epizy.com/avast_free_gratis_per_un_anno.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_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 5312 bytes
SHA-256: 0610b6f0eb35f30fcb4881ba974ed6d00d784f451e318952d29c976773c74711
font_01_sfnt_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 10908 bytes
SHA-256: cac9aff26a30a5181490ba552201efdaeccbd62f1c52d5624d630b4d8be9d930

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