Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3af94247793d124…

MALICIOUS

PDF

80.6 KB Created: 2021-04-01 21:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5d92454c7a76e95400b71c5f1e7ad071 SHA-1: 9c1cdc223be1ac3dace8728b853992e4ad7b5749 SHA-256: d3af94247793d124dfbc4dadbe9d0e6a8c5c73673df022111c31d0c816166375
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a domain associated with phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure and embedded links suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=how+to+convert+moles+to+kilojoules PDF link annotation
    • https://cdn.sqhk.co/sobexofap/a8jiYgj/snes_roms_for_android_phone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383692/normal_60373e90e0f6b.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/hjPf0i8/wwe_smackdown_tonight_live_stream.pdfIn PDF document text
    • http://bimufufedo.22web.org/jurnal_pengertian_titrasi_kompleksometri.pdfIn PDF document text
    • http://leftoutclub.com/puwejole4fksk.pdfIn PDF document text
    • https://cdn.sqhk.co/zikoxazobe/b4geLid/my_airtel_app_free_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/jazygda/lock_screen_live_wallpapers_ringtones_w._engine_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410018/normal_603df1d6636d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447663/normal_5ffb9141247c3.pdfIn PDF document text
    • https://cdn.sqhk.co/sirezozere/iegf0Ar/maplestory_m_android_release_date.pdfIn PDF document text
    • http://avtoshtorki.shop/vocabulary_workshop_level_d_unit_2xvqvm.pdfIn PDF document text
    • http://vereffka.xyz/cbse_class_11_chemistry_ncert_book_downloadp2quv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xezeruv.epizy.com/28947569887.pdfIn PDF document text
    • http://fugovolit.rf.gd/bookworm_game_for_pc_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b062b85-883a-4885-b26a-ebe66433d15b/xorevanopebepotibom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7ffd541-a6ca-492e-bf4f-667326426ead/mazabedeta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/553e8941-cdd3-4407-997a-8be95d1d8a4b/zunubilikidebunuwefejati.pdfIn PDF document text
    • http://jomexikosuzujis.rf.gd/how_to_set_up_the_singing_machine.pdfIn PDF document text
    • http://kozatoreke.rf.gd/40250908038.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_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 4988 bytes
SHA-256: 19561a2d57b4bf8eb65a3b7120b5ef035fae93aa57040262d3b8ca65bbe7ddc2
font_01_sfnt_off0000f428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF428 12308 bytes
SHA-256: 87f4aee332800fe262c645e63a3b4c2d817e63e4dee9c78a50b3c7f13dfa683b
font_02_sfnt_off00011e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E47 16128 bytes
SHA-256: 9876d0897ec9c8daf800546b62de215c972fdd6e45e85ac3a8ec620a70dbc6f8

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