Malicious PDF — malware analysis report

Static analysis result for SHA-256 338daab05ebe1de5…

MALICIOUS

PDF

79.6 KB Created: 2021-03-29 22:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 653930175a1980e59b8c218d491e5ddf SHA-1: 525161be81888d269309fa46c3f84c281d1aa23a SHA-256: 338daab05ebe1de593c351bb649c9ba3064f161b04e91b13f6fdb75c2ebcc22c
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 0.9990

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://vilenefex.ru/strik?utm_term=how+to+calculate+use+the+z+table PDF link annotation
    • http://anyita.space/el_libro_azul_usa16new.pdfIn PDF document text
    • http://helplnstagram-confirm.com/dropout_nation_worksheetauzps.pdfIn PDF document text
    • http://jowakemanek.iblogger.org/80822499758.pdfIn PDF document text
    • http://kismyketio.com/fodajirifususalicptrv.pdfIn PDF document text
    • http://gifagudilul.mypressonline.com/38394275999.pdfIn PDF document text
    • http://helper-badges.com/hitman_2_ps4_unlock_all_weapons8yjei.pdfIn PDF document text
    • http://wurilozi.scienceontheweb.net/54918397628.pdfIn PDF document text
    • http://circleshtang.xyz/how_do_we_calculate_energy_efficiencykemvw.pdfIn PDF document text
    • http://samafutanub.mypressonline.com/ap_biology_campbell_10th_edition.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/15cd8c15-41fa-47ae-a569-b8eed74503a9/sakerujanukenigej.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/49201655477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/332abce2-b6d3-4033-a016-83e766a8339c/11049080936.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/natavoxawijaliz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88da01af-c01e-44dd-bfa6-34098769c2ce/how_to_change_light_bulb_in_ge_monogram_refrigerator.pdfIn PDF document text
    • http://manepiri.epizy.com/85177025754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f197b6-6888-4d31-8fb4-ef97b896661c/52692559219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6df682a5-65d8-4264-800c-3982f7eb54ff/69668105746.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/22532094462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56802747-3910-4944-89b0-2d296a5a9b77/how_do_you_freestyle_rap_for_beginners.pdfIn PDF document text
    • http://zotuxegusam.epizy.com/honeywell_chronotherm_4_thermostat_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a81df78-e0f0-4141-83cd-da11bdee8e57/53451170377.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/game_brawl_stars_mod_apk_revdl.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/piriformis_anterior_pelvic_tilt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c81627bc-a105-49b5-971f-06ad38bbb217/fisher_paykel_refrigerator_red_light_flashing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16dae915-684c-4710-93c8-2fa59639bf24/19609993510.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_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 5036 bytes
SHA-256: fd1911ea0be4344813e822c8491766474da2e0eb066e418b3269a6e79b7dfbaa
font_01_sfnt_off00010442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10442 13668 bytes
SHA-256: ad50c7f3900e8d798bfed8d5f596910812f840d84b4b7e7b2b4c73bfe8a87370

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