Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ea1e94abfb5c42…

MALICIOUS

PDF

122.6 KB Created: 2021-03-19 02:18:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 478cedc0c7f971bbd6a407478f7bfae5 SHA-1: 2a202703dc0ff2a1f48aab430fee2efdd1e5b044 SHA-256: 85ea1e94abfb5c42b72c0f122eeb2ef9e56da13ad29c24bd888246375c741e66
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous external URIs, with a primary suspicious URL being https://golowaki.ru/award?keyword=cpld+architecture+pdf. The PDF's structure and embedded links suggest it functions as a link farm designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/award?keyword=cpld+architecture+pdf PDF link annotation
    • https://zimivopup.weebly.com/uploads/1/3/1/3/131381614/836d1f696f1ea26.pdfIn PDF document text
    • http://xelamoxadavas.mywebcommunity.org/alcohols_phenols_and_ethers_ncert_notes.pdfIn PDF document text
    • https://tuxativavowaz.weebly.com/uploads/1/3/1/4/131437956/3537036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447270/normal_6050d246012d2.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/3943268304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410985/normal_6021a2e6ea7b5.pdfIn PDF document text
    • http://gozimudowojuzun.mypressonline.com/xoweluxov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473030/normal_5ff30ae22ad5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380854/normal_60126fe1dec5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408336/normal_5fcd6c351beb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379477/normal_6047ccc3c34ff.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/615e771b-f7ef-4b51-9daf-b98b3313d485/lg_revere_3_sim_card_location.pdfIn PDF document text
    • http://vowojuxibaxo.myartsonline.com/99083992139.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/certificado_de_origen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91f5dbee-e1f6-4ae3-ba3e-9cf27f99d326/how_to_charge_a_flip_video_camera.pdfIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_4d0587408d194832ad5fd9d9309b01b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/76c7801f-b0a2-4231-810d-09b285402252/30794059072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1c6a55d-6f25-40bb-b5d1-40b683768923/vefidumegakonigeve.pdfIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_b32c9fe0dfd746bc8a0cce4649159f06.pdf?index=trueIn 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_off0001a4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4D5 4968 bytes
SHA-256: e5d80f13b26b6c11131a7aa5a5833237336ddf443b73f6f1e9a4c79e51d4f4c5
font_01_sfnt_off0001b5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5B4 11600 bytes
SHA-256: f3e13cc7dc607e51c8bbcb2d1e51679dc24108a2cd470cd2c5982744c5abb74f

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