Malicious PDF — malware analysis report

Static analysis result for SHA-256 b484139fb4535f28…

MALICIOUS

PDF

81.5 KB Created: 2021-03-06 07:37:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 95712b8adb69234efff542016e738ae5 SHA-1: 226ddb5a9c497eb9d711800a5e3c0ef60ed787b9 SHA-256: b484139fb4535f2880d4dc913552690b9a3383e6190e9d843d436c8077120677
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ML and ClamAV, as malicious and likely phishing-related. It contains numerous external URIs, with several pointing to disposable domains and potentially malicious content. The PDF structure itself is also noted as a link farm, further indicating a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://jumiwimov.ru/wix?keyword=bucket+drumming+basics PDF link annotation
    • http://bamupiwabibajew.mywebcommunity.org/77410450789.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/20115137979.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448556/normal_5fdd447a20ef9.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/87951932937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_6017beac53fa7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367296/normal_5fff2e7f341e6.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/present_perfect_simple_and_continuous_exercises_3_eso.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/rosugibutenena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_6035b34e8a493.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/how_to_find_fourier_transform_of_cosine.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/35255143317.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/neato_d7_connected.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444884/normal_5fcce58b58e6a.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/snap_on_torque_wrench_digital_1_2.pdfIn PDF document text
    • http://talajudoxuxip.mygamesonline.org/38931154474.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/50359a75-9b95-4810-8d62-3d47b84cf758/whats_the_least_calories_at_taco_bell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2fc83b4-32f4-49d3-ad56-ec1de35c90bb/valetilalobevubajekenam.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/2d_design_v2_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ff6910-f14a-42d8-b591-4d776f8d8fce/warhammer_40k_8th_edition_rulebook_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/edit_text_box_font.pdfIn PDF document text
    • http://wugetad.myartsonline.com/diary_of_a_wimpy_kid_2010_movie_screencaps.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/osrs_rune_gloves_guide.pdfIn PDF document text
    • http://suvalomimo.atwebpages.com/fronius_ig_plus_state_240.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/53813943746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/115937a5-5b15-4da8-9245-f7e2f51f3c98/how_much_does_it_cost_to_change_a_heat_exchanger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72407a79-5ef3-450c-93b1-56ae5cb3408f/8426129062.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/flower_for_algernon_quotes_and_page_numbers.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_off000101cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 5480 bytes
SHA-256: 1d93f82ed39399f25dff839a55bd10701d15b27c33d1dbdbe9b5c547dd28fce5
font_01_sfnt_off0001145c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 10476 bytes
SHA-256: bc64892de1a1b620be4bceb053c5b1958079be82ceceef7dadf6fcaa977646b2