Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c8fd09edccb321…

MALICIOUS

PDF

77.0 KB Created: 2021-04-16 17:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cbe35bc7805a227a077f21d7de7c60fb SHA-1: 72fb67a2675e1210fe597f87ee0376dad5894ee0 SHA-256: d6c8fd09edccb3216b9a7518573491cee17f733748b6d67873ed59a10767659e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/strik?utm_term=bmw+x3+maintenance+costs PDF link annotation
    • https://xodumusekow.weebly.com/uploads/1/3/4/7/134708755/polelugul-walizabexesog-bedolusapotopow-fabemiromevo.pdfIn PDF document text
    • http://bitalotava.scienceontheweb.net/logical_reasoning_questions_and_answers_for_class_9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377912/normal_5feeae82786b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498893/normal_5fc9c37a8516b.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwobevina/VrBrFgf/7163474133.pdfIn PDF document text
    • https://cdn.sqhk.co/sisowufabo/ojibGoQ/wallpapers_for_iphone_xr_coral.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/iiidifZ/groupme_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/hiejgNW/31380761340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411252/normal_601b6e9a794f6.pdfIn PDF document text
    • https://kuserivexujeza.weebly.com/uploads/1/3/4/3/134331384/babewigajunebu.pdfIn PDF document text
    • https://nitafigiwulizo.weebly.com/uploads/1/3/1/4/131406945/kipadejurolepa.pdfIn PDF document text
    • https://mekupefaju.weebly.com/uploads/1/3/5/3/135316310/bexibipefuwu-jiput-devepazozok-ziponijulojaxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378606/normal_5ff79d0eb57dd.pdfIn PDF document text
    • https://cdn.sqhk.co/giwitosak/kAMjbgg/healthy_foods_printable_coloring_sheets.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/mowinisodikazuzolevulu.pdfIn PDF document text
    • https://govalusazun.weebly.com/uploads/1/3/5/3/135325024/3097316.pdfIn PDF document text
    • http://mogimetekojubar.scienceontheweb.net/is_the_book_prisoner_b-3087_fiction.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/vurufozurepubof.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/anca_positive_vasculitis_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/the_education_of_a_value_investor_audiobook.pdfIn PDF document text
    • http://senajukuwizef.epizy.com/james_stewart_early_transcendentals.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/18333486225.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/41335261248.pdfIn PDF document text
    • http://salulasalanegox.rf.gd/besides_that_formal.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/75245328226.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_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 5188 bytes
SHA-256: 741dfad657ed17118c81872788499da3be0d22665b96e13c5908373217a32dbe
font_01_sfnt_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 10668 bytes
SHA-256: 0f7a6c07f71556300a2038310048fcffeece2b80cfb45d87b44fe9b1580547d0