Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4f5c941d048b6c…

MALICIOUS

PDF

74.7 KB Created: 2021-06-06 19:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9253d90366bbce29f2a83817bea8fb41 SHA-1: b65dae3d42ead07e54acfb7d758e0815c9c13339 SHA-256: ab4f5c941d048b6c6894864cba9ccca352e2a14a3191a3a03856be02a5dbaabf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pistant.ru/pbw?utm_term=is+there+a+cheat+to+send+gold+cards+on+coin+master PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4482849/normal_60b23b67ea626.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406202/normal_5fff0b4ce6e5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495399/normal_606725e30e316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493553/normal_6064d5785a6d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445750/normal_60499af83e73c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376599/normal_600e2209ca0b1.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/106391b5-6481-4575-84cb-f16bd4637efb/volar_sobre_el_pantano_resumen.pdfIn PDF document text
    • http://kedajawi.pbworks.com/f/47399136275.pdfIn PDF document text
    • http://buluwogot.pbworks.com/w/file/fetch/144718551/xoxawowewevevikurofu.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/download_cheat_database_ppsspp_ppsspp.zip.pdfIn PDF document text
    • http://gitixofipoxu.pbworks.com/f/lefokowujodod.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/rapitest_digital_soil_test_kit_review.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/w/file/fetch/144491889/math_exercises_for_grade_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d06e4928-164c-4de2-a904-37cb93657343/software_quality_management_plan_template.pdfIn PDF document text
    • http://rabopadob.pbworks.com/f/kunci_jawaban_akuntansi_keuangan_lanjutan_buku_2_salemba_empat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dd9a87b-5f08-4865-9b55-10961abcf362/how_to_start_a_home_decor_line.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1dca88-74b4-49c6-8546-cff6593b9cbc/how_to_clean_lg_waveforce_washing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b07bd9a-b807-4423-a811-ea41f91d4406/fofemo.pdfIn PDF document text
    • http://jopamedet.pbworks.com/w/file/fetch/144687453/how_to_replace_lid_switch_on_estate_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e03cf5-f69b-45fb-8eae-6248e6bf67c0/what_i_love_about_you_fill_in_book.pdfIn PDF document text
    • http://wuwolufit.pbworks.com/f/moboduvud.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_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 5288 bytes
SHA-256: a5af7abd09b4a677584cc5651721543c24bc7756b478fcf7f49790e3cafc4b7f
font_01_sfnt_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 10240 bytes
SHA-256: eda571ca22540cd0ddc951915d1a5e28bfc2c7a287eb66d199b4bdf99884c9e8

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