Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71a8aff3e47a93e…

MALICIOUS

PDF

72.3 KB Created: 2021-02-12 13:24:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 72d2bd46b70985d4010389fbd705a5b8 SHA-1: 911d0738dfda1853114374ca96f0566d825dedb7 SHA-256: b71a8aff3e47a93e206d370bbd24ffae0ee27b1befb4d7c08ea98853d25106e9
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs, with several pointing to domains associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users through multiple 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
  • 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://bologen.ru/123?utm_term=convoluted+universe+5+pdf PDF link annotation
    • http://purpless.vip/60784360206pp1px.pdfIn PDF document text
    • http://healsmall.space/xunaxajagofixixurududaxesi1ln9.pdfIn PDF document text
    • http://nupigit.22web.org/42877126121.pdfIn PDF document text
    • https://lobavasato.weebly.com/uploads/1/3/1/4/131483685/8565065.pdfIn PDF document text
    • http://magic-world.site/74740620531dun9j.pdfIn PDF document text
    • http://load-bcp.com/felujafitu0187p.pdfIn PDF document text
    • http://neuroncraft.online/46055933020kdqya.pdfIn PDF document text
    • http://werenntaq.online/adobe_acrobat_xi_pro_serial_number_lyv3n4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gemimixobisuju.epizy.com/jopixewiv.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/basic_one_english_exam.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/10750214941.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/88575960636.pdfIn PDF document text
    • http://kigexozuzexozo.rf.gd/essay_writing_template_for_ielts.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/90647612606.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/tuwokisir.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/62088318133.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_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 4912 bytes
SHA-256: 9c6f9cd22890ab3dcf5281d409b4db7bd2c1131620e2541d3493be67fd90edca
font_01_sfnt_off0000efdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDF 10800 bytes
SHA-256: 997ac273ad77b86e154893225e23057df426fad2309657298bd7dbb080bb20f8

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