Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc887381ec9e6bf…

MALICIOUS

PDF

77.6 KB Created: 2021-05-22 17:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0addd252caa0e35cd00527f3cf85e548 SHA-1: 93892e4d83206966e412e01a80c5d88a4d411e36 SHA-256: 3bc887381ec9e6bf3be4a1f0e2016657fd15a912776440c4e35403a3dcb287e0
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is 'https://kuzutuzo.ru/strik?utm_term=yamaha+alto+sax+yas-23+serial+numbers', which is likely used to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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=yamaha+alto+sax+yas-23+serial+numbers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485818/normal_60259f5fa1673.pdfIn PDF document text
    • https://roluliduz.weebly.com/uploads/1/3/4/7/134771057/badiforam-ritirubotopegij-woxomulixisakem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403410/normal_60126e055268b.pdfIn PDF document text
    • https://dilasakezonaxos.weebly.com/uploads/1/3/0/7/130775260/furunajuselo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426416/normal_5fc849a7a157a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476420/normal_5fced4c13c55d.pdfIn PDF document text
    • https://zuvagojajom.weebly.com/uploads/1/3/5/3/135398962/jusikomigonibow_negude_putuf_jebeg.pdfIn PDF document text
    • https://sasominafa.weebly.com/uploads/1/3/4/3/134362810/kegapopotek-dovebugap-ketofugitagutok.pdfIn PDF document text
    • https://sajozigita.weebly.com/uploads/1/3/0/8/130814351/d67af08b24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nonabafat/29135711535.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/karel_answers_wix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05e55c0b-3503-45bf-91f0-a39092ea2cb7/hp_deskjet_3050_driver_mac_big_sur.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/whirlpool_microwave_oven_combo_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/438958f0-21a8-4b57-a5c2-72b07b6604cb/descargar_discografia_de_antonio_aguilar_completa_gratis_por_mega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f5d6c5a-0411-4fe9-a8cb-682d50458bd6/kepunomexusikabis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf515b3-2b2c-4501-9ae9-ab0f67111fc7/30030988941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f487e6-20e0-4220-8205-6642a5e24831/trane_xl90_installation_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/ajay_atul_ganpati_songs_album.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/spss_amos_24_full_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/richard_rodriguez_hunger_of_memory.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D4 5404 bytes
SHA-256: 93bd5043e809a8ca5441fd678c69e862e274caa0c182d5c9adb18afe4583b70c
font_01_sfnt_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 10448 bytes
SHA-256: 44ea416d8b34e8fd818ae3fa4330c03ba6e4a6fb9724a1ecbd4be8f2e448c4f9
font_02_sfnt_off00011ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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