Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4c6c45a22b4a9a…

MALICIOUS

PDF

77.1 KB Created: 2021-02-16 23:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 419d17be92b29d8bb2de29298f502c42 SHA-1: 2d5889d4d7397e0f719083cd4cead24b49b307d4 SHA-256: 4c4c6c45a22b4a9a817620a2b294f35ae7e23698650f879cebbbb27626d5e1bd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links pointing to other PDF files hosted on various domains, many of which appear to be disposable or used for SEO link farming. This behavior is indicative of a malicious document designed to manipulate search engine rankings or distribute further malicious content. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=venn+diagram+reasoning+questions+pdf+in+hindi PDF link annotation
    • https://jarowezib.weebly.com/uploads/1/3/0/8/130813985/xamajuf.pdfIn PDF document text
    • http://spainwow.pro/72657665746j7b74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_601b458e7ac82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461791/normal_6018d97c08388.pdfIn PDF document text
    • https://lalupapetawosi.weebly.com/uploads/1/3/2/8/132816164/9c612ea70d2b6e.pdfIn PDF document text
    • https://leduzurukidep.weebly.com/uploads/1/3/4/8/134858842/juzotibofugoji.pdfIn PDF document text
    • https://sokepubin.weebly.com/uploads/1/3/5/3/135391759/xusimoduko-fesipuwakijepa.pdfIn PDF document text
    • https://vemenujobife.weebly.com/uploads/1/3/5/3/135399872/puvodaf-mobujos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475571/normal_5ffacb4607594.pdfIn PDF document text
    • https://vurikiwuguwek.weebly.com/uploads/1/3/1/4/131408439/vesuwixibegusatefo.pdfIn PDF document text
    • http://idealica-italiauficiale.website/format_of_two_column_cash_book0rni4.pdfIn PDF document text
    • https://reledizov.weebly.com/uploads/1/3/0/7/130775001/wonexojoranawuvo.pdfIn PDF document text
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/3669427.pdfIn PDF document text
    • http://creamwalls.space/xitorilarekidifak2bag.pdfIn PDF document text
    • https://bijimuxe.weebly.com/uploads/1/3/4/8/134886115/tozuzesimirulix.pdfIn PDF document text
    • https://regafuraseni.weebly.com/uploads/1/3/4/6/134663643/zanezalifaminuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480749/normal_6012908076cfa.pdfIn PDF document text
    • http://fruktovik.com/chichora_full_hd_movie_filmywap1xbn4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449395/normal_5fca99c11d357.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 5516 bytes
SHA-256: 823f29f89d16b64fa59bdb6f0db35b40ee81aae300ffba6f24640c396e34cbb0
font_01_sfnt_off00010492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 10208 bytes
SHA-256: cd73c5afa71ca10c74a3cbed830088fb498e6dbf407651e7b2a664b577a2abe2

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