Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ab40e8e08103ac…

MALICIOUS

PDF

77.5 KB Created: 2021-06-12 23:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c8acba5209d926b6c9e4293814fb9d84 SHA-1: eec5055f998593188ee3921f4a63fe3b6c6a9f19 SHA-256: d1ab40e8e08103acb70855e02fe6fda83e8b30521718d8cf6171e7b39e6689f6
126 Risk Score

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 0.9990

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://medvor.ru/pbw?utm_term=chara+addon+mcpe PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tujelupirobe.pbworks.com/w/file/fetch/144492810/dominion_east_ohio_gas_login.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144412455/zurudexuvekivojodimone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1773069-e45c-4e8a-9499-02d8b871214b/nazonolekomodabu.pdfIn PDF document text
    • http://wenuveraroto.pbworks.com/w/file/fetch/144708690/download_adobe_photoshop_cs3_full_version__crack_with_keygen_free.pdfIn PDF document text
    • http://pijovaj.pbworks.com/w/file/fetch/145105731/create_eks_cluster_using_terraform.pdfIn PDF document text
    • http://wudiwiligis.pbworks.com/w/file/fetch/144811782/how_to_turn_on_drawing_assist_procreate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7506575e-6245-4c07-a579-e0829b8a9610/jibefaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f4956e1-affa-41f4-90da-0b0b76ebebd8/macbeth_act_3_multiple_choice_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/624a8093-88cd-4d1c-a3be-3e401e75df95/mujoxil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27a60118-c73b-40b2-addc-28ec59f760d9/dudepufemonavunolab.pdfIn PDF document text
    • http://tuvovazuvezo.pbworks.com/w/file/fetch/144731334/how_to_reset_gmc_navigation_system.pdfIn PDF document text
    • http://ririgifavem.pbworks.com/w/file/fetch/145035249/anatomy_bd_chaurasia_download.pdfIn PDF document text
    • http://rumusapage.pbworks.com/w/file/fetch/144646539/understanding_vocabulary_for_ielts_speaking.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/f/fit_body_boot_camp_workouts.pdfIn PDF document text
    • http://kawawuvaken.pbworks.com/w/file/fetch/144998529/17519644985.pdfIn PDF document text
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144630075/official_isc2_cissp_cbk_reference_fifth_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70538cef-af89-4e7c-a1e0-d4401bd2458b/edmentum_answers_english_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa82fe59-5124-4acb-8844-a00520824da9/samsung_tv_software_update_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd8afd76-1f79-48e7-9af2-e0f222515ab8/my_clicker_garage_door_keypad_stopped_working.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/w/file/fetch/144779628/tojalopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdee83ad-5aa9-4c30-8eb3-c8a49561dbfa/word_meaning_prone_to_violence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02a9006a-2d18-4444-91df-372972914f9d/how_do_i_pair_my_plantronics_bluetooth_headset_to_my_laptop.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD431 3052 bytes
SHA-256: 53bae745717e0e141bcf91dba5a19a281ca9c8c3c1d9b3c57676b4825e8b2ef2
font_01_sfnt_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 5008 bytes
SHA-256: 51301a102c45d4b9c4dff9e81772b77318c04a60fbb53762bd7de9623a7ae686
font_02_sfnt_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 10332 bytes
SHA-256: 763baeca4c5f04ae0a21decf878d934eec5b7a9f363f718184e8f753eb3cb4f9
font_03_sfnt_off00011382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11382 16060 bytes
SHA-256: d7dbcefd5a9d087f9dbd48d87e5b82950a900fa0f666d4a1f78598b818f3f613