Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee99d9c763d4f49…

MALICIOUS

PDF

123.5 KB Created: 2021-03-28 07:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0c4043b73c9ccde8d2a4e84d9a65261e SHA-1: c40fbf80564a8187a4961dc44b4a6f390ee72194 SHA-256: aee99d9c763d4f49edd52f94a712abce57ad561e3c0f9615fb31edb52122630f
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and flagged as malicious redirectors or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to a 'Timex ironman triathlon manual', suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://dafemum.ru/strik?utm_term=timex+ironman+triathlon+50+lap+manual+pdf In PDF document text
    • http://nibewubixela.getenjoyment.net/kakagopofiguvefobuvose.pdfIn PDF document text
    • https://fisabovetusita.weebly.com/uploads/1/3/4/5/134597566/c390d96ef72a8a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403543/normal_6036d281df397.pdfIn PDF document text
    • https://wibixebaroz.weebly.com/uploads/1/3/1/8/131856543/2736943.pdfIn PDF document text
    • https://sozumibazukupiv.weebly.com/uploads/1/3/4/7/134735026/sebukepejorikovan.pdfIn PDF document text
    • https://bituzuvuzi.weebly.com/uploads/1/3/5/3/135389462/1378811.pdfIn PDF document text
    • https://pivatebovuwize.weebly.com/uploads/1/3/0/7/130775292/9d49f59e.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/como_hacer_hoja_de_vida_en_word.pdfIn PDF document text
    • http://wofixizufiw.22web.org/pixenogimezutabuvelagi.pdfIn PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/67b01d6b022b.pdfIn PDF document text
    • http://gamukanemafutu.mywebcommunity.org/21628164740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470523/normal_6033b55919394.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sazojojuw.rf.gd/fisakikirutapeguwi.pdfIn PDF document text
    • http://gitodake.myartsonline.com/mamewenuwovozazebunebab.pdfIn PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/larapenunulosev.pdfIn PDF document text
    • http://manepiri.epizy.com/bmp_to_converter_online.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_off00019ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19ED9 5384 bytes
SHA-256: 7d3a5e62f7848dab55f7d190859e19fb797c5d363134c318e16437da211111a6
font_01_sfnt_off0001b102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B102 15548 bytes
SHA-256: fc8660366d4a1d2cba2afe2242681289a5711fdd824875d55729265413da4eee

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