Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8c67f4ccdb5e2d…

MALICIOUS

PDF

69.7 KB Created: 2021-04-02 23:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0555042130ae60f9a9ca9977914a9b6 SHA-1: 7375c5ebe31df4d42962af7970b01e2b8e1004e8 SHA-256: df8c67f4ccdb5e2ded3ebb35fa5b634ee253a577e2ed67daa319b8f41d9da396
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain ('resalured.ru') that is likely part of a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/wix?keyword=yertle+the+turtle+quotes
    • http://jalazekesofijot.medianewsonline.com/pdf_to_word_editable_converter_download.pdf
    • http://modezewop.mygamesonline.org/81825632062.pdf
    • http://bimonetejatoleb.mygamesonline.org/indeks_pembangunan_manusia_adalah.pdf
    • http://weridif.medianewsonline.com/77672425549.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_29afd04701b34b66802d473d8ee21b91.pdf?index=true
    • https://s3.amazonaws.com/buwosevax/lit_answers_down_reddit.pdf
    • https://s3.amazonaws.com/lixisariwulo/zilebomagadirewer.pdf
    • https://s3.amazonaws.com/rivazixexuguri/timetable_template_google_sheets.pdf
    • https://619c993e-e215-4b07-891b-88776ecab8c8.filesusr.com/ugd/1fce43_b06568aa0e9d4dd188a29bd19812cb28.pdf?index=true
    • https://s3.amazonaws.com/zosevid/graphing_rational_functions_worksheet_2_key.pdf
    • https://uploads.strikinglycdn.com/files/7d6e5b4b-01bd-44de-add8-aa5e50b13cb3/rinimijaxatidoja.pdf
    • https://s3.amazonaws.com/pexodugosa/lyrics_english_song.pdf
    • https://s3.amazonaws.com/rawesaragegugar/50867438966.pdf
    • https://s3.amazonaws.com/polojuliragam/ditoranunedamupojadepes.pdf
    • https://s3.amazonaws.com/tumasun/34222589243.pdf
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_fb00720e07ca4a9da2178bfc3c0064dc.pdf?index=true
    • https://s3.amazonaws.com/jixeremipet/what_is_process_customer_service.pdf
    • https://uploads.strikinglycdn.com/files/9478225b-d56a-4cbd-a1f5-bcdcd32630be/alan_watts_quotes_waking_up.pdf
    • https://s3.amazonaws.com/gozilum/top_10_apps_2018_android.pdf
    • https://uploads.strikinglycdn.com/files/dbc0baef-d386-4ef1-a7df-d3551b43bc59/netgear_fvs318g_throughput.pdf
    • https://uploads.strikinglycdn.com/files/f725f260-5bc9-4af1-9981-b2017fcacc31/how_to_order_ikea_catalog_2021.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_off0000d4fd.bin
46f8eb544d8648ed1c833dd9c6306790816c9bc37c3dc0ffed31f009a992fc46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 4648 bytes
font_01_sfnt_off0000e4ca.bin
8639d1693a4a0ea256ca2ddf65d5bd521f5630d3f03650ebdb6f2f3515df2298		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CA 10940 bytes

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