Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ecc3e570849700…

MALICIOUS

PDF

84.1 KB Created: 2021-05-17 13:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0251a262f2f012913333d874d514a1d0 SHA-1: 59a3053852c949bb0b7c42ae4236648b15b022af SHA-256: 51ecc3e570849700c3fc4ed66ff2d54a4e6b7eb1bcdb25dbdb305642e4a5ee6c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The embedded links, such as 'https://yafferge.ru/strik?utm_term=bible+commentary+online+matthew+henry', suggest a phishing or credential harvesting attempt. The ML classifier and ClamAV detection further support its malicious nature, indicating it likely serves as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=bible+commentary+online+matthew+henry In PDF document text
    • http://akmurzina.com/1994_polaris_sportsman_400_tire_sizeo5ob5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478131/normal_5fcbee62e5b71.pdfIn PDF document text
    • http://hookup756.fun/perform_row_operations_augmented_matrix_calculator3uvg8.pdfIn PDF document text
    • http://cybety.xyz/rerilojifubigt3xs.pdfIn PDF document text
    • http://petersikdar.com/how_to_solve_equivalent_ratios_with_variableszb1pp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_604140fbb24d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501029/normal_5fd678c93c23f.pdfIn PDF document text
    • http://lifeit.pro/wow_fishing_bot_piroxuka2x.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/70c5ec52-8faa-4048-8e83-2d66bcc3e238/how_to_replace_an_ottlite_bulb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9460506-29ec-45d5-8769-6b734e3504a8/19711668414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e644557e-271f-4f8c-9a4c-bb48806599f5/minecraft_combat_handbook_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d284db9a-f432-4727-8412-1e95709a6cdc/asus_p8z77_v_lx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8e4b09a-c63e-4fa0-9694-ad93610b3574/90053889753.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bf692a7-a216-492e-8b61-2ae9fe0cfea0/how_long_is_the_mortal_instruments_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a3fe87-f467-41a2-afd2-0b23c8468ab6/10234619553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1b24de3-497c-4492-b955-b49113979f5f/paper_plate_clock_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a4a0b1d-23d7-4b66-ba7d-8e909b276542/vikiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76a4fb0b-a2b1-4c28-89e6-4ed2e7c91d58/26223508626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8298c77-8680-43aa-8cc9-426bb54e9f4f/free_area_and_perimeter_worksheets_for_2nd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d4ce632-44b7-4a8b-8503-cdfc94c85807/newuxizoganesowepewiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/797f4cc2-8ede-4bbb-9429-d00ee441e8a0/php_dynamic_website_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/457644b3-e873-4a95-ad0b-7415f753b511/how_to_charge_air_hogs_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/882e4566-aec0-4b72-b364-37fbd5d3b385/epson_wf_2540_factory_reset.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_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 5244 bytes
SHA-256: 3d4eac7d14bc7f1ee4f126875d8875c5b32514c879e122f382fb0a2755eb1164
font_01_sfnt_off00011bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF5 10840 bytes
SHA-256: 88ec07a55a422b4aba25a4f8496d5dfb39781d7fe0fb87837466a356e5a68b45

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