Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f430acd07bece08…

MALICIOUS

PDF

78.9 KB Created: 2021-04-01 16:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceb0fe5d3aaf33b09bbd4905f78c8026 SHA-1: ebb5a8051bdb8ace975a798db8ee73c72d240380 SHA-256: 0f430acd07bece08689cdf745037f3244f160ab2c74d42a821acf90392c5651c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, indicating a link farm or phishing lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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
  • 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://dafemum.ru/strik?utm_term=the+last+song+cast+miley+cyrus+soundtrack
    • http://xivitej.66ghz.com/beyonce_homecoming_documentary.pdf
    • https://taxedomarofagu.weebly.com/uploads/1/3/1/3/131378921/dogewirima_zitefam.pdf
    • http://rivugijunamusi.mygamesonline.org/fovusexe.pdf
    • https://mizefowoxeze.weebly.com/uploads/1/3/4/4/134485365/3628891.pdf
    • http://gilitomenuxame.22web.org/workplace_emergency_contact_list_template.pdf
    • http://vorakumezaxof.mygamesonline.org/41679357087.pdf
    • http://sifinujox.sportsontheweb.net/78974537972.pdf
    • https://wepopoxewu.weebly.com/uploads/1/3/1/1/131164118/7316da10f9662a4.pdf
    • http://xubajur.mygamesonline.org/novaxevexumavalovudetap.pdf
    • http://kemedejovon.getenjoyment.net/biology_project_on_human_heart.pdf
    • http://fuzabura.sportsontheweb.net/functional_programming_in_javascript_luis_atencio.pdf
    • https://tumurotijom.weebly.com/uploads/1/3/4/5/134512141/tekomufovagividazifu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0af78357-396e-4fde-b801-40553124591e/contrato_de_arrendamiento_de_vivienda_sencillo_puerto_rico.pdf
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_aee453caf2844fde96dfcc3cc703b3f9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dbdc73d2-63ae-4471-b1ee-61abedb4f960/par_quoi_remplacer_feve_dans_galette.pdf
    • https://uploads.strikinglycdn.com/files/31a68515-6698-42c4-9380-323ed40b2fce/juvoduxun.pdf
    • http://dozuxix.myartsonline.com/loi_binomiale_formule.pdf
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_7a3fe49f2b37463193f0af12b626c1d9.pdf?index=true
    • http://nepafex.epizy.com/bayesian_classification_in_data_mining.pdf
    • https://uploads.strikinglycdn.com/files/07e587ae-f258-4c09-b8c0-5572df5e54c0/lilevofirawubumubugi.pdf
    • https://uploads.strikinglycdn.com/files/8d1a52ca-ed48-4301-b9f9-0b197796d094/elder_scrolls_online_assassin_build_2019.pdf
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_c3f2e389367045fb886e396333cc7036.pdf?index=true
    • http://japinoxizidunub.myartsonline.com/how_to_remove_adt_panel_from_wall.pdf
    • 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_off0000f59c.bin
966e712ada61ff2b02df2ba841718c01f49fdb8276d41b4e6ba95a931f50833c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 5468 bytes
font_01_sfnt_off00010812.bin
a70fab488df35afc4756b642d2c66a319b9467b0fca151f057502056a7f8a655		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10812 11136 bytes

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