Malicious PDF — malware analysis report

Static analysis result for SHA-256 8682f2eeafddd677…

MALICIOUS

PDF

128.5 KB Created: 2021-03-16 21:32:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eea1242d1b3dca9201c1e962d7728aaf SHA-1: 2f155154f9d2c1a34428bbd26a3a46e85949c1c5 SHA-256: 8682f2eeafddd677acd4d58ba65fe46037f53ed3704c82142b83bf5ac8f03793
226 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. It uses a password-protected-archive lure. 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 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://botokaw.ru/strik?utm_term=cyberpunk+2077+release+2020 PDF link annotation
    • http://tivuximuliku.mygamesonline.org/mathematics_for_economists_1994.pdfIn PDF document text
    • http://jubigale.scienceontheweb.net/burupawibapum.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/cq3hcbz/among_us_whatsapp_sticker_pack.pdfIn PDF document text
    • http://tetiviguxawik.getenjoyment.net/fifty_shades_of_grey_book_6_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/kepilujofeje/gchbjaM/34720848295.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/gihaica/king_of_dirt_apk.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/26038624-5cb0-4c50-80c4-09f526099859/is_the_yeti_microphone_good_for_singing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7291ed23-0cb6-4294-b096-765126402330/complex_carbohydrates_found_in_many_plant_foods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cb52995-c101-4ccc-8b2f-62049609e0ad/how_to_use_a_yarn_loom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b783fa62-cd05-4b5f-b133-005e754e0d7e/lexebukutapapolukopikekub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e366623f-e2c6-4b27-8b02-2b557a34694a/dafoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e04ddf83-1f07-4a3e-9c64-8ae8cccc12bd/51971094122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d717c969-d592-420b-bad0-13cf6d46feb3/tintin_2_film_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f014e281-da97-4687-b672-230f50638936/befopuvajawij.pdfIn PDF document text
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_600e80d746b24681b6bf28d459add997.pdf?index=trueIn PDF document text
    • http://litorow.myartsonline.com/riguxuwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cd8e061-fd26-480e-bbc1-093d556974f5/bash_shell_commands_cheat_sheet.pdfIn PDF document text
    • https://620678a0-8f5b-407b-881a-8a96a128c1c4.filesusr.com/ugd/25b7a6_fda84208b98448fca73ca7176abf9694.pdf?index=trueIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_7edbb2bd26a14128ae8bb77a34d280eb.pdf?index=trueIn 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_off0001a6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6A4 4788 bytes
SHA-256: fc412dd550be8fcb883655af38eca9f5abd1933640580a0d476ccfba71f7b163
font_01_sfnt_off0001b75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B75B 5380 bytes
SHA-256: 58996250f959d8191ad7b64f114386a1604a50397be7f2b75ba190519a59dbbf
font_02_sfnt_off0001c9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9BC 13004 bytes
SHA-256: d7a41727301af9fc0612aca9fd2d3487583a0edc7e07f665fe3b78948e0c839e