Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a25623c05eabeb…

MALICIOUS

PDF

170.1 KB Created: 2021-05-09 21:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9446a969584af8398773b27156dd820c SHA-1: 94ca763ab345c57e93fd10cce8385a65adc0209f SHA-256: b4a25623c05eabeb29f728275bb2e5f7235f21b2fd6724e1a47337dde9f2c4d4
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs, with one prominent URL pointing to a domain that appears to be a redirector for phishing content. The document body, though heavily obfuscated, suggests a lure related to 'Charles Darwin origin of species pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=charles+darwin+origin+of+species+pdf PDF link annotation
    • http://antinomi.design/what_is_the_judicial_system_uk2enn8.pdfIn PDF document text
    • http://prechambre.xyz/weber_spirit_e-210_parts17jg4.pdfIn PDF document text
    • http://nukels.xyz/what_is_a_survey_in_qualitative_researchkwfoq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372073/normal_60580523dae2b.pdfIn PDF document text
    • http://apelsins.space/faluwibikomudt89ld.pdfIn PDF document text
    • http://thehensleys.org/dibonoredikararwf7i.pdfIn PDF document text
    • http://kyhni.site/11443112375pq5wj.pdfIn PDF document text
    • http://a1metromovers.com/308841375060d2e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414864/normal_5ff4d1082eac6.pdfIn PDF document text
    • http://theporte.xyz/whered_you_go_bernadette_book_reviews2q2p.pdfIn PDF document text
    • http://big-ita.space/15991579448tasxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_0be94b51938145a398716c275a3ad3be.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_4224b84c1c8541f9a13879ac2bc0d886.pdf?index=trueIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_a98646c133b347d984c4f0a80bfb0ae8.pdf?index=trueIn PDF document text
    • https://c72a6d71-2fad-4f5a-8b7a-a7c165485bce.filesusr.com/ugd/a4966f_652d2885dc5a4cc4a94b983db0ae0c5f.pdf?index=trueIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_aafc0424f08240999364c16f37cf270f.pdf?index=trueIn PDF document text
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_086a6770215840dbb63bf816585c6679.pdf?index=trueIn PDF document text
    • https://bb0106b8-f3e0-414b-a873-a0e24df3f2ad.filesusr.com/ugd/b84a33_5a33002b6706410b9ad8fd2f76ab83e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61ea3279-b308-41d5-b74f-3f2f00a93645/2002_ford_explorer_sport_trac_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fa322a8-c983-4b37-b12e-4b133e25420d/dawipifudim.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_off00025f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25F8B 5416 bytes
SHA-256: 9681a9ce4ebb8962c96330f2210196becf53de836f93c6fbaaaafb6478adcf0b
font_01_sfnt_off00027201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27201 12700 bytes
SHA-256: 4f76e82e1286554f088c090ab818b4e123acc8dd8f45c3dbf435055cd2b8625f

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