Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d22f12e44962b4…

MALICIOUS

PDF

73.8 KB Created: 2021-05-30 01:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 666fec554461da9293bde7e496c8ef34 SHA-1: f4c2577a69d5bc2b3590cc1fa22bf688ba40c12b SHA-256: 23d22f12e44962b4ebff51d418d45d9a3a98312c6106cfb21a65b4525ca38110
186 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 hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/123?utm_term=nouns+adjectives+and+adverbs+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455672/normal_5fd7019cea296.pdfIn PDF document text
    • https://kubegagalinono.weebly.com/uploads/1/3/4/7/134714436/gipetawebavo.pdfIn PDF document text
    • https://tedaliduvif.weebly.com/uploads/1/3/5/9/135957254/5684744.pdfIn PDF document text
    • https://pupalizote.weebly.com/uploads/1/3/4/7/134716330/wikavugokupepi_mogixebat_simofeve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_6059bbe15922a.pdfIn PDF document text
    • https://lapefobok.weebly.com/uploads/1/3/4/6/134663543/kozogefewolukodi.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/dorepejolatu-kikamavefiwa-baxokop-namewotexivu.pdfIn PDF document text
    • https://totuseki.weebly.com/uploads/1/3/5/3/135322554/fonizijolako_vusasop_niputumoputulan_fexesos.pdfIn PDF document text
    • https://nadevakijod.weebly.com/uploads/1/3/4/4/134490940/jisep-ladupololiru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423166/normal_6025457e290b0.pdfIn PDF document text
    • https://gaxasonazeg.weebly.com/uploads/1/3/4/3/134375181/6507889.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443809/normal_5ff94173977e9.pdfIn PDF document text
    • https://wanesutilujat.weebly.com/uploads/1/3/4/8/134868149/4803641.pdfIn PDF document text
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/8059008.pdfIn PDF document text
    • https://dibugovag.weebly.com/uploads/1/3/4/7/134710264/7a5b99d1f5da35a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5fe519c2bf1d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408352/normal_605f408fca0a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca63d8f-1a83-4535-980e-2b246351a1d0/xowifok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae2ff76-6152-40ea-ab7e-fb7556474280/human_anatomy_and_physiology_1_b_pharmacy_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d9a720a-9ee8-44f3-a2bf-97fa0c4f49a4/sosemetew.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_off0000e2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 5396 bytes
SHA-256: 9f480512395564d5270f90943bcc0f75ed55b0fd5d84fc46cf9edda1300c4b33
font_01_sfnt_off0000f563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 10740 bytes
SHA-256: d08cd33f18eb91f6b093a34241e4bc2ffa61c7a8969db5b472185f5d89dc03a0