Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c48a34b3804781…

MALICIOUS

PDF

79.4 KB Created: 2021-03-16 22:06:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f4ae4c3f07605f75d7165c7b2874de3 SHA-1: eb7eb6cc553798711c1d19ba39805c62ff341c53 SHA-256: a1c48a34b380478166e7c0b4dffe8154d59fe58bfc548588d431a95a579d354d
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://pelibifir.ru/wix?keyword=european+soccer+champions+games
    • http://bositozibab.getenjoyment.net/toxigulurawuriwi.pdf
    • https://gasimela.weebly.com/uploads/1/3/1/3/131398285/dufedasitugofap.pdf
    • https://cdn-cms.f-static.net/uploads/4459170/normal_60148fbce3b4f.pdf
    • https://wekosidofanepa.weebly.com/uploads/1/3/2/6/132696212/bukowejivebategi.pdf
    • http://sysfix.ru/what_are_the_different_types_of_organizational_structure_and_give_example73sej.pdf
    • http://suwufexez.sportsontheweb.net/came_to_believe_online_free.pdf
    • https://cdn-cms.f-static.net/uploads/4477877/normal_601ca1ed348b5.pdf
    • http://899themes-demo.ru/623950392480vx8u.pdf
    • https://vukasusig.weebly.com/uploads/1/3/4/3/134349680/kedus_wezogejus_zeforobotedag.pdf
    • http://kerosijuvibeg.scienceontheweb.net/vonibolijiwewasip.pdf
    • https://static.s123-cdn-static.com/uploads/4373522/normal_5fe24bba9013c.pdf
    • http://dududuw.mypressonline.com/pomuzuteguzotozowekarudoz.pdf
    • http://erogan-oficial.site/how_to_program_rca_universal_remote_with_vizio5gowc.pdf
    • https://cdn-cms.f-static.net/uploads/4506200/normal_604461166a44a.pdf
    • http://tumuduwaju.mypressonline.com/kenmore_front_load_washer_reset_button.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_9e0959aabf1840d4b99ab4b98e32505f.pdf?index=true
    • http://fidegaf.atwebpages.com/how_to_connect_onn_soundbar_to_tv.pdf
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_584ac4d2984b42029b2eb3800037cd88.pdf?index=true
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_5504d9aa4d574a16b64232e95ede5a22.pdf?index=true
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_289b821afc1741329970a63660678071.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_off0000f76f.bin
c0a66de6c32e1825bed36679aa9ac14315db8ef498a8742c527e23c8ddd98c77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 5272 bytes
font_01_sfnt_off00010932.bin
6266ad0b197c4759cf02c7c8d37da1cee2e5759864233112bf3ca495cf6b4abe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10932 11628 bytes

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