Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27d767ecf61ed43…

MALICIOUS

PDF

77.9 KB Created: 2021-05-29 05:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ea756d7d2196a4dab61f65079d1910e6 SHA-1: 26b858839d67979d142bd530ee74d1385f67f324 SHA-256: a27d767ecf61ed43387372c9f8de63be911699b6c0b76190f754da982faaaf1b
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to manipulate search engine results. One prominent URL, 'https://resalured.ru/strik?utm_term=five+nights+at+freddy%2527s+game+download+free+pc', indicates a lure related to game downloads. No scripts were extracted, but the PDF structure itself facilitates the link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://resalured.ru/strik?utm_term=five+nights+at+freddy%2527s+game+download+free+pc PDF link annotation
    • https://rubitolagaju.weebly.com/uploads/1/3/5/3/135330326/11eb6add.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482617/normal_5ff1f54e55adf.pdfIn PDF document text
    • https://xafituku.weebly.com/uploads/1/3/4/8/134863640/3930876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460057/normal_601ae9a55fbaf.pdfIn PDF document text
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/56ab67da0818ca.pdfIn PDF document text
    • https://zuwufapiju.weebly.com/uploads/1/3/5/3/135348861/mibanizali.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/7caa2632.pdfIn PDF document text
    • https://tenekitu.weebly.com/uploads/1/3/4/0/134018212/sujovunuvujigivegutu.pdfIn PDF document text
    • https://wuvatefowid.weebly.com/uploads/1/3/4/4/134470889/8782448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418379/normal_603ed4891de40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490519/normal_6022e9a5a8d8f.pdfIn PDF document text
    • https://mizemajawoxulu.weebly.com/uploads/1/3/1/4/131437858/3618546.pdfIn PDF document text
    • https://kiwiwutirove.weebly.com/uploads/1/3/4/7/134707888/1673885.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/143702f4-6b50-403c-80d5-b292e6da72c1/how_to_measure_volume_graduated_cylinder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee5fb53e-90b7-4c03-bc22-3e995a79c5f8/itil_service_operation_2011_edition_best_management_practices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4b987d1-4207-47ef-9a8e-5363949195f5/are_canon_lenses_compatible_with_sony.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ac1c3c-3530-4385-a7bb-ec464f98fd5a/is_it_worth_staying_alive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85c81f1c-05db-4377-a74a-26ca0719c593/theatre_the_lively_art_10th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/042080e3-8585-4650-a451-5776d0e6a550/does_facebook_have_live_chat_support.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/843f9f01-3517-49c1-ab9f-26ac8c81c38f/99543121675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32322872-7cfc-45da-930c-e798111f7c6c/nuvebewexuxigujaban.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/529db1fd-5d89-4118-8050-f4ad6a2b0406/how_to_write_a_summary_4th_grade.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_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 5812 bytes
SHA-256: 22abe6113991b6c117479bba8aba2ac812765afab37caea1e05b3ef9f9af54e4
font_01_sfnt_off000102c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C0 10880 bytes
SHA-256: 7966d94169d6b9a29dd17cd22b13163925168a059a09a85a0451839bb52deec3

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