Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ecbd1dfe4934f1…

MALICIOUS

PDF

82.7 KB Created: 2021-04-05 14:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 99067a2ea4faec011cc440dbf7df18ba SHA-1: 0276b6edf8f5cebf8fe06fd4293053cf938ead81 SHA-256: 21ecbd1dfe4934f1fd154904bcdc16803d37dab3d7642591348e44e92c2bb545
186 Risk Score

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/wix?keyword=yellow+christmas+cactus+plants+for+sale PDF link annotation
    • https://fuvedomuwipiw.weebly.com/uploads/1/3/1/6/131636935/gowodin-ronufemuk-lofulosakujo.pdfIn PDF document text
    • https://telexetobowu.weebly.com/uploads/1/3/4/3/134339901/51fa7f903a972.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/g8gejgQ/kidigete.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/gqjc8ey/golden_boot_winner_2014_premier_league.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/iihhef5/96373328558.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/logukuzipu_jufabijug_begerelaraxila_monameb.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/iqgjP09/jurekododezosekenefiwipog.pdfIn PDF document text
    • https://fefoxotavom.weebly.com/uploads/1/3/5/3/135328849/167844.pdfIn PDF document text
    • https://cdn.sqhk.co/sologavabo/9o1S2ib/36405124603.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/4647beaf-468f-4356-b6d5-c06c644fc2e3/how_much_does_a_childcare_worker_earn_per_hour.pdfIn PDF document text
    • http://zosajaxuv.epizy.com/irobot_roomba_655_pet_series_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/896c4b03-c5fc-45d5-96b3-32831100edd9/remote_control_app_for_non_smart_tv_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6faa3bb9-679d-4d71-87f6-a243a4400f2a/modern_living_room_decorating_ideas_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15aa654-f0d8-4855-8f94-53bf311e549c/1999_polaris_xplorer_400_value.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a66f5bf8-8b0f-49ed-8443-0fe2d3e02e67/the_blind_side_book_chapter_3_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98b35d50-3e23-4f04-bc70-7f79600d0187/36944377322.pdfIn PDF document text
    • http://legopabez.rf.gd/rabies_post_exposure_prophylaxis_guidelines_philippines.pdfIn PDF document text
    • http://nefajipuvob.rf.gd/la_odisea_resumen_del_canto_11.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_d95f21c3ef684ab792944dd1a1dc2243.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/acba2bb1-1a8f-4e15-b9b8-df0ee69f34bd/winegard_carryout_g2_sat_dish_dish_direct.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/687feb4e-b775-4da1-a4aa-89968228b8b1/intel_dh67bl_driver_for_windows_10.pdfIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_5f4c1e5ae6f14d599528a152d243ab45.pdf?index=trueIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_b1b3988282594160b19cf6dd845f4455.pdf?index=trueIn PDF document text
    • http://borebatibi.rf.gd/kahoot_smasher_apk_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/110015cf-164d-4cd5-9dc9-9452607e69ba/how_to_change_resmed_cpap_filter.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_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 5308 bytes
SHA-256: fb4c827976d4867d5e90b275c4a4b4c967ce40e2a68e6a18b03e759d7df83da1
font_01_sfnt_off00010376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10376 10544 bytes
SHA-256: 186ecca09ea470503df7347fa1bb3c18da889cceaa71098451dcc0951ac2f6c2
font_02_sfnt_off00012797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12797 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501