Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b6eba1846a856d…

MALICIOUS

PDF

86.4 KB Created: 2021-03-14 20:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f112c45a13bc9756c9e463eaefd9bd26 SHA-1: 545eaf3a463083a4544119afde5de82fcad05037 SHA-256: f3b6eba1846a856de8acabb10a9412ed242290038e01f20de0891c8a500d2278
166 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 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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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.
  • 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://dafemum.ru/award?keyword=asma+fisiopatologia+pediatria+pdf PDF link annotation
    • http://snapchat-alert.com/facebook_lite_apkmonk_downloadxrge2.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/iiivPoR/your_nails_done_while_pregnant.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/higfPja/best_free_bubble_shooter_app.pdfIn PDF document text
    • http://wopexobow.mywebcommunity.org/best_shocks_for_stampede_4x4_vxl.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/ijadigP/pubowebegojovagavelunum.pdfIn PDF document text
    • http://proita.fun/22271477244zv0dv.pdfIn PDF document text
    • http://conicppjry.bid/google_spreadsheet_l_gqkqmv.pdfIn PDF document text
    • http://rixadixiji.scienceontheweb.net/39178919374.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/geriromamopf5.pdfIn PDF document text
    • http://boxijogirexu.medianewsonline.com/where_to_buy_blood_bowl_miniatures.pdfIn PDF document text
    • http://fomijegi.mypressonline.com/tebulikagelapukov.pdfIn PDF document text
    • http://madamzero.com/sisuwedog57to.pdfIn PDF document text
    • http://botefin.medianewsonline.com/madogipoxuru.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/MjuIBje/oxygen_levels_normal_air.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/Lhcidid/cheap_driving_schools_near_me_prices.pdfIn PDF document text
    • https://cdn.sqhk.co/nebuwaxisiw/4hfIjgG/dead_cells_barrels_of_fun_weapons.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/0d9e7163-0657-4e2d-b7dd-cc965379f897/what_was_the_first_rap_song_ever_recorded.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be7c1bb7-26a2-4d35-93b2-a07cf8160b0a/how_do_i_update_my_tivo_software.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/what_to_put_on_resume_for_skills.pdfIn PDF document text
    • http://zotubune.myartsonline.com/67654405907.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_off00011201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 5348 bytes
SHA-256: 2ee1d470294a3447bfd0b87684716c275057d4ddc4d8704ce5a0f5806da915b5
font_01_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 11960 bytes
SHA-256: a4dc6b8d7e247f537d05d1586fec3780be1e8fabca091e77987fda526026f72a

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