Malicious PDF — malware analysis report

Static analysis result for SHA-256 7426d33c26f30071…

MALICIOUS

PDF

83.2 KB Created: 2021-03-26 01:00:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cae8a03f311e8be1a59187d30010e829 SHA-1: 1498ed0f9c7b7b7d9bb4a1beee58e778a140eaf6 SHA-256: 7426d33c26f3007162dbe88c07b0399e73e904c8690c3c5d0e5524b0fa1902a5
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 0.9998

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://fokemale.ru/strik?utm_term=does+homework+help+elementary+students PDF link annotation
    • http://xosubowavenu.mypressonline.com/anyong_tubig_worksheet.pdfIn PDF document text
    • http://vajokopopozikem.medianewsonline.com/66271703007.pdfIn PDF document text
    • http://apsmall.space/tefimik0wdip.pdfIn PDF document text
    • http://raisinslabs.club/how_to_pronounce_the_name_ivaniaqo8m2.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/heSijhf/gimimudewar.pdfIn PDF document text
    • http://urolog.xyz/17456414186vjcn8.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/26215397043.pdfIn PDF document text
    • http://regivag.iblogger.org/afcat_eligibility.pdfIn PDF document text
    • http://buvalopexur.mygamesonline.org/paradise_lost_book_4_line_by_line_translation.pdfIn PDF document text
    • http://movikikigemalo.iblogger.org/sevevuxe.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/hunter_x_core_will_not_reset.pdfIn PDF document text
    • http://ritixabig.iblogger.org/74501477799.pdfIn PDF document text
    • https://cdn.sqhk.co/zegodoxelob/eohcgd6/nonfiction_text_features_worksheet_4th_grade.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/ms_project_2010_user_manual.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/810b16fb-7496-44f2-80af-61549594f629/jbl_flip_3_stealth_edition_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d51ea606-a542-43bc-9c1a-e3b89dbe93d8/the_paper_bag_princess_board_book.pdfIn PDF document text
    • http://pusebirenox.myartsonline.com/borges_averroes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd64f30f-92c1-4b62-96cc-566b9ceb94c2/tp-link_tl-wr710n_v2.1.pdfIn PDF document text
    • http://safavaxuvabobir.rf.gd/kallax_4_cube_assembly_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8cc153b-c761-4d6e-ae11-036baf88e8ae/40150900264.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_off000105cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CD 5456 bytes
SHA-256: 86a7354f36023f422bc75f4a2038392eed57fdc7a376a75997d71bb8ed259610
font_01_sfnt_off00011843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11843 11776 bytes
SHA-256: 8090580715f77efbdd4abed989b64b03a76ff01327850b6a6ea11680a954ddec

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