Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8ed5dce8e05a5d…

MALICIOUS

PDF

84.1 KB Created: 2021-04-12 12:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9e3a76ac58a283b31a3d6c9a6936dce4 SHA-1: 9dccc632e4eacd4ded96e4c12621e12109bb507e SHA-256: 4b8ed5dce8e05a5d6490dd29b73c1439ae6f8dfbc0c738309fa79317a590d75c
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/strik?utm_term=epson+m244a+service+manual PDF link annotation
    • http://xisumagogali.getenjoyment.net/printable_bubble_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/nibugikik/hbgeFjd/timibijetidezu.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://bilemupu.weebly.com/uploads/1/3/4/6/134654663/f6c3bb3bee6721.pdfIn PDF document text
    • https://bizudabug.weebly.com/uploads/1/3/4/7/134722823/solavemigixelun.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/jiNhhdu/to_the_moon_and_back_book.pdfIn PDF document text
    • http://nijewogifuzazi.mypressonline.com/vobatanimesajexuziraza.pdfIn PDF document text
    • https://cdn.sqhk.co/raninogozo/hjjigzO/51491120999.pdfIn PDF document text
    • http://goodshopsales.xyz/sumodarin5sks3.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/YQjb1ia/download_game_boboiboy_galaxy_offline_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/84a7e994-0618-4854-a307-8cd1cebe836e/hp_5520_printer_support.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4379ea55-cf36-4c91-9370-501573c2df70/how_much_is_a_first_edition_harry_potter_book_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c71116b5-d541-4b92-ab83-6ffb7cdd01ce/zebaxevofenuwafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/179660b5-00a9-4dd9-9e8d-d3c86f14c5cc/burger_king_coupons_2021_nz_2020.pdfIn PDF document text
    • http://naxesabefadufu.atwebpages.com/l_carnitina_subcutanea.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17f5fc36-29c2-472d-b749-8e3e4b424bde/50899125623.pdfIn PDF document text
    • http://positajugopisu.myartsonline.com/zajukib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b116369-8bd4-4619-aa02-cda5f74f031e/sifapiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3e3227c-fe57-41bf-a092-275169b8f85d/verizon_fios_modem_firmware_update.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 5120 bytes
SHA-256: 01f23618621f4ad25595e61bb296e74f87a8e362ac0061a8567068507cf375fb
font_01_sfnt_off00010fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 10580 bytes
SHA-256: c1d28b69bec07beac9b77a5ee973086c257fbe09edbc477859603cadc0258c5a
font_02_sfnt_off000133af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e