Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b61f0d8bd829834…

MALICIOUS

PDF

75.4 KB Created: 2021-05-23 04:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0d6aceee8b72a50590fb7345fe12d2fe SHA-1: e350af9adcf709ecb6013a12b73c1a4347e93d2b SHA-256: 8b61f0d8bd82983439198b771f0be4ffe697aa5dedbf8686b50600ea429ea6b5
194 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by multiple heuristics as a redirector for phishing. The document body, though heavily obfuscated, appears to be a lure for a document related to 'Krugman economia internacional pdf 9 edicion', suggesting a phishing attempt for potentially sensitive information or to deliver further malware. No scripts were extracted, but the presence of a malicious redirector is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://crophysi.ru/strik?utm_term=krugman+economia+internacional+pdf+9+edicion In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/41162320973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a9584f2-dca0-402c-9f4a-bd77e084c472/27165863659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9c5a544-3598-4a77-a09e-758669cfd3b7/just_2_words_answers_level_1192.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/35586094586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab2f286-8a38-45ee-8523-96de839fb184/bobemuzenudom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/537af5df-0250-43bf-b8b5-30aa5bc50674/what_size_drip_pans_do_i_need.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec88e1dc-9e26-4c31-832e-fb8488e9a742/what_restaurants_are_safe_for_peanut_allergy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2867828f-3c66-4f1b-8ad7-7f0f09330709/catch_me_if_you_can_trailer_italiano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/393482dc-3ba8-4cae-bc39-0b7b68bfff64/ti_nspire_cas_student_software_cracked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa1a0c33-a8ca-4af3-9fe1-eee79e085acb/93444173595.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/xurujafivixanavirof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eb39c57-1c19-481d-baab-3412111c0316/how_to_top_up_cashcard_using_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9edd069e-a547-4bb7-8b05-09548c734d3c/3054851352.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/nebisewuf.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/potonokevaximixomilese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9469aba3-5061-49ec-9316-f391304cb539/59020466907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a7d8f84-9983-439e-afde-bd81a0afe310/tracfone_lg_optimus_fuel_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93956c07-a826-4aa0-8806-1de116bc4e66/85479587091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f38c6c3c-32b0-4f61-9c6f-15adb6224d6b/97359505972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e47e13b-f7f1-413f-ae17-b4e4db28cee6/license_key_gta_5_download.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_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 5424 bytes
SHA-256: c8fffb34b9c7e68f969e33e9f921cb64a01dc2ff04f04c0611d57d5c006678b0
font_01_sfnt_off0000f668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 12500 bytes
SHA-256: 0a5dd7af35e70dc3076bdd9de3c4bc30a3fcd35dbbf0a14e52242bf7a5da7bd5