Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b828d35509bda9f…

MALICIOUS

PDF

95.4 KB Created: 2021-03-14 16:12:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5c22db3a3110667df602cf8eccc8ab4f SHA-1: 6a300e03905f5c46dc29ca03701ce58a63e92e29 SHA-256: 5b828d35509bda9fcf89dc0ffb42bfdf93ecaa5b694def87e5d5043b5e3231f7
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for SEO manipulation or to distribute further malicious content. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://kuzutuzo.ru/strik?utm_term=que+es+etnicidad+en+mexico PDF link annotation
    • http://lutafem.getenjoyment.net/17073062915.pdfIn PDF document text
    • https://judenebubiz.weebly.com/uploads/1/3/4/6/134656374/3869442.pdfIn PDF document text
    • https://cdn.sqhk.co/kesusevuzep/jgjdhi3/44713938212.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/hdwiavr/7820580939.pdfIn PDF document text
    • https://tuvikeba.weebly.com/uploads/1/3/4/7/134732988/supowi.pdfIn PDF document text
    • https://cdn.sqhk.co/pidenali/9ujbijr/free_iptv_for_android_tv.pdfIn PDF document text
    • https://xuberirerumona.weebly.com/uploads/1/3/4/5/134586272/bowutafosure.pdfIn PDF document text
    • http://vomoliba.scienceontheweb.net/jolibojovope.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/gfyjdOx/5437489108.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/TgGbhig/birunelikojapimasadizuvez.pdfIn PDF document text
    • https://beluloxepivizor.weebly.com/uploads/1/3/4/1/134131295/8000671.pdfIn PDF document text
    • https://pawonojureva.weebly.com/uploads/1/3/4/5/134522231/vopeg-gomug.pdfIn PDF document text
    • http://detonic-official.website/why_does_my_nespresso_milk_frother_not_workqeexb.pdfIn PDF document text
    • http://antonioita.fun/51377577438tzaca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jowosos.myartsonline.com/80589298007.pdfIn PDF document text
    • http://zizidamikedug.epizy.com/portugus_arcaico.pdfIn PDF document text
    • http://gateguka.epizy.com/risk_matrix_project_management_template.pdfIn PDF document text
    • http://kapowuxivi.atwebpages.com/beginning_latin.pdfIn PDF document text
    • http://rurebafib.onlinewebshop.net/benefejusifa.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_off0001359d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359D 5088 bytes
SHA-256: 17f527368104ea451edbbe7f3f372effff1a4eacb77eabe334fd9ceb76e5b4c0
font_01_sfnt_off000146e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E0 12496 bytes
SHA-256: ecfb874d241ce021d99417ce16fb3835a30d9e405ea95e74cac49fb5e8ab61f0

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