Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6be2074ef872ebc…

MALICIOUS

PDF

70.9 KB Created: 2021-03-18 15:51:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f8b0bb0429ee820f7b65f12c064ea56 SHA-1: 96570acfed26efbdd97bd0b5b5f037845d97b8e4 SHA-256: d6be2074ef872ebc13e9b9a0648cb0f090a5181767b2e735a9a878d9ed17b9b7
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host many links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://crophysi.ru/123?utm_term=face+sheet+mask+boots
    • https://giwuvapelefawi.weebly.com/uploads/1/3/4/8/134869604/sowibede.pdf
    • http://retys.space/uniform_boundedness_conditiont9seu.pdf
    • http://figimumagoko.mygamesonline.org/biwunubinivikusiwuroz.pdf
    • http://dkmz1.club/age_of_z_origins_intimacyrc0kg.pdf
    • https://dowoxadi.weebly.com/uploads/1/3/1/3/131380004/wubap.pdf
    • http://nigavereke.mygamesonline.org/jewusinumofugajugulaki.pdf
    • http://mavito.online/ranuwetugagme.pdf
    • http://futup.ru/words_that_start_with_xenamqudg.pdf
    • http://gakawisogafuga.mygamesonline.org/definicion_de_estrategia_de_aprendizaje_segun_autores.pdf
    • http://sunny-web.ru/honda_gcv160_pressure_washer_pump_diagramcxxeh.pdf
    • http://zodelem.mygamesonline.org/timijokitigoja.pdf
    • http://cashbackk.site/83491766427z3yv2.pdf
    • http://salonlabs.xyz/kavuvufexawuvnrz8n.pdf
    • http://jifarobajis.sportsontheweb.net/alphabet_tracing_worksheets_a_z.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_7b82c4bf600b428fac6ddd8bdebccd25.pdf?index=true
    • http://lewinozed.atwebpages.com/98005048566.pdf
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_b4e767a2f33b4045be36d99898baf58b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7c4.bin
759d4fb0a10f54e93ac92f7abfcdf7f9b82240e55c29589f3c36a32a9d8c8a7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 5068 bytes
font_01_sfnt_off0000e8e1.bin
57145fcaebdbceb3a76a1d6e973effb4c9983d899dd2a8e29f24bffdf9b807d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E1 10992 bytes

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