Malicious PDF — malware analysis report

Static analysis result for SHA-256 748b2ffe5b391d7c…

MALICIOUS

PDF

77.5 KB Created: 2021-03-27 17:31:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6e36ff75a2dac17a3300c2bb7479e4a5 SHA-1: c77898b4c6d4f2a9b30e7330f18347c5f27d8137 SHA-256: 748b2ffe5b391d7c6a0b2d93ecff87fcd107171940ac6ab1c515f8c69c5c98cd
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9995

Heuristics 4

  • 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://nipisod.ru/award?keyword=boondoggle+instructions+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469633/normal_5feb23c8ec2bc.pdfIn PDF document text
    • http://kigurumi.org/lupasaxuvonezomozimetae0ej9.pdfIn PDF document text
    • http://netlysy.online/124987346121nkr2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448339/normal_5fd9752053f78.pdfIn PDF document text
    • http://makamar.tech/adolescentes_tetonas_chupando_polla16gae.pdfIn PDF document text
    • http://nikaold.site/planeswalker_dnd_5el1xra.pdfIn PDF document text
    • http://herss.space/kaantasan_ng_pang_uri_worksheets_grade_7hirkl.pdfIn PDF document text
    • http://fitdieta.com/what_happened_in_american_gods_season_2_episode_8iyjp4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503767/normal_5fe90ddee57ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426071/normal_605cac3983939.pdfIn PDF document text
    • http://digitalmicroteter.xyz/music_online_free_for_androidc9nk0.pdfIn PDF document text
    • http://disconto50.pro/collier_county_beach_red_tide_reportmkud6.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.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/55232350-058b-480a-99ff-b8cc5b0d6b74/16201315898.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/daaru_peeke_dance_video_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/zinob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/079e5f4c-898a-47be-a7ac-c7998c65ddd2/manugalubu.pdfIn PDF document text
    • http://suwewonopega.epizy.com/89344956556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5da92db-24b6-43a8-bd27-1dd079cef8fd/2009_vw_rabbit_transmission_fluid_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c9c6d0d-6557-41c6-a36f-7adb4e8a663f/american_society_for_aesthetic_plastic_surgery_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/pijalifefubozarep.pdfIn PDF document text
    • http://zinexisororip.epizy.com/64917115118.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_off0000f0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 5164 bytes
SHA-256: c87124a06302c8b6c4e316f07e1bf9cba6b3a1f683f01dbf753918e4b82b8146
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 10672 bytes
SHA-256: 462834c9ea573ebd1b65cee3c5aa8aac8721e429e3ab59fc41a15a733407ca5f

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