Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28e7400b861efd1…

MALICIOUS

PDF

76.0 KB Created: 2021-03-15 23:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5defca8aa9b7254c63bb901f8c0c864e SHA-1: 1bfc1549ac5222cdbdb8e1646e52ad91fea4232e SHA-256: e28e7400b861efd10a19118100ec38d408611b8ff3a5e387aa818511ce330978
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 campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. The document body, though heavily obfuscated, appears to be a lure related to search queries.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ponafet.ru/strik?utm_term=does+nicholas+sparks+have+any+new+books+coming+out PDF link annotation
    • https://cdn.sqhk.co/kubepugemaki/SW2CZhh/digital_marketing_strategy_ppt_2020.pdfIn PDF document text
    • https://tujiniwiko.weebly.com/uploads/1/3/5/3/135350236/vuxepag_muwuletokil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424692/normal_6018a30978a8f.pdfIn PDF document text
    • https://kokozorakozuwel.weebly.com/uploads/1/3/0/7/130775651/fakuvifofixeb.pdfIn PDF document text
    • https://rirupalolidofe.weebly.com/uploads/1/3/4/6/134601765/ab92e219837082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381291/normal_5fd2a03d4adf2.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutazomaga/RKDgfhh/ghost_in_the_shell_characters_tv_tropes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416806/normal_6043a4c1c153e.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/0WAgrji/file_manager_app_download_for_pc.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/rebaxagagi-dafem-ferized.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/76bdf537-cc32-425b-910e-f3b07035a1ae/69391232253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8221cb4d-bdd0-4603-a842-11e2aa7ab79d/how_much_cost_to_install_a_mini_split.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_ffe261720a6d43798c3093a3db5e6eb2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0934e36-ab83-400e-adb8-addbfb21ae34/tabela_de_preos_de_carros_seminovos_da_chevrolet.pdfIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_b213a9edd4854a30aa1b3ca8ef47dce1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19cd3186-1c4f-4829-85fd-30a2452d9f93/vejunugatusizigub.pdfIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_4bc37b981c1e4ccbaa309379d2a00396.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72d5c1d5-1d3d-48da-b4a0-59c298e17ccb/how_much_is_a_55_inch_roku_tv_at_walmart.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_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 5804 bytes
SHA-256: d60620c6459948ecf78be3f5a895f406ec7afb273b2389b1e24839574c33a3d5
font_01_sfnt_off0000fc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC32 11540 bytes
SHA-256: 599c330ff922a05c23f092500e178471ad080c7a24bc0f2f3b9ea4700fb72e6d