Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2161a33ae926b7…

MALICIOUS

PDF

88.5 KB Created: 2021-03-22 16:25:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c7030e12514f3c392a61337f405be42b SHA-1: 3c7af1623f3333af8bddd15e2dea6ef09d760869 SHA-256: 8a2161a33ae926b7a977664a647d025ddee30af38ac1e15ca9486b0da29adcf2
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/wix?keyword=sniper+elite+v2+ps3+trophy+guide PDF link annotation
    • http://salonhq.xyz/86193015179qnjau.pdfIn PDF document text
    • http://all-host.site/elementary_differential_equations_11th_edition_solutions5d07w.pdfIn PDF document text
    • http://wodaretibinusad.22web.org/bounty_hunter_2016_korean_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/gQhbUig/8203806042.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/S2ibgiQ/download_pocketmine_mp_for_android.pdfIn PDF document text
    • http://naturebiolog.space/zopegenejalujoroki70f5t.pdfIn PDF document text
    • http://xuriretijidaja.22web.org/jakujerorepifebivuwuf.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/ihfjbhf/my_hero_academia_rescue_mission.pdfIn PDF document text
    • http://topdouche.xyz/dokemepp26oo.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/frUihKK/sefodonaposubusagilozap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fokezazonof.epizy.com/pejobujezumopomatidaru.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/54691282902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5aff421-eb24-4af5-8852-034932def6e8/ejercicios_gramatica_ingles_bachillerato_resueltos.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/62826182272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36c96806-dec9-4dc8-a11d-0dafce28ea1d/how_to_use_rhetorical_triangle.pdfIn PDF document text
    • http://jupanev.epizy.com/are_the_harry_potter_movies_similar_to_the_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2ac9f9f-2c07-4b6c-a689-f48b71021530/69116665072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00dfb431-1356-4b6e-a74a-2cd3151f4aab/netgear_gs108e_manuale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df42b489-cf0e-47b3-8340-08aacd769718/48148803637.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7ecac7d-c263-43be-8f01-51232f59c540/what_is_better_a_single_stage_or_two_stage_snow_blower.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/mechanical_comprehension_questions_and_answers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 5572 bytes
SHA-256: 6c8afe0a671ddc29d23a6a61cee98bba748110802395a88fd7f4d7a634d5fca1
font_01_sfnt_off00011add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADD 11004 bytes
SHA-256: ed220ad3a87cb6492ea1336fd8ffcfc0872d3b8ffed8731d0cff8991b4dd5595
font_02_sfnt_off00013fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC4 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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