Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f1c3d5e8345c0a…

MALICIOUS

PDF

86.8 KB Created: 2021-05-29 17:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0306c4ef4ec827dd4e305880d1ffb92f SHA-1: 5bf253cfbe0574087f73a7ab48780ebf1e53c45e SHA-256: b2f1c3d5e8345c0ae205403204792ad7ffbb1475dfe357245a86ad356128fd14
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary malicious activity observed is the distribution of numerous external URLs, with one notable URL being https://soxebez.ru/123?utm_term=gallbladder+diet+plan+pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://soxebez.ru/123?utm_term=gallbladder+diet+plan+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474470/normal_5fef8abcc4b49.pdfIn PDF document text
    • https://vinunawamezod.weebly.com/uploads/1/3/1/3/131380031/natumer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_604ae7dd0fab5.pdfIn PDF document text
    • https://romesezex.weebly.com/uploads/1/3/4/6/134605020/tibol_buzojamexilave.pdfIn PDF document text
    • https://jutasosunefobe.weebly.com/uploads/1/3/4/0/134012390/nuwabokapek_xanunavonepa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5fcf3c0835fa7.pdfIn PDF document text
    • https://mumimobubaw.weebly.com/uploads/1/3/4/6/134640569/tiwinemozug_pivozeb_vilevezo.pdfIn PDF document text
    • https://bigakajufejala.weebly.com/uploads/1/3/4/2/134265656/muriboneboza-xurav-pobigejujijisik.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/7f7434bb-789f-4d1a-a9ae-59fbe3f41e28/how_do_i_know_if_my_rv_battery_charger_is_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a18c35e-d072-4e40-82d7-c0b59b97b67a/jofolulixusuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8a2a907-9204-4c72-bc3e-0c8f434beaf7/what_is_shadow_and_bone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f746552c-dc4c-4bfe-b2b6-55c62516bc19/momuvixurokutom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d6ad7cd-9493-4f52-852d-b72be632cda5/diary_of_a_wimpy_kid_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f998766b-01b9-4a26-be7c-62fb17d9275c/soretoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4bcdba4-cc2c-4b59-9621-91b99ae71f3f/how_to_apply_to_waffle_house.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4edc2ac-4365-4bfc-805e-f2e0719680bc/8261356347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b27589c2-cd83-478a-9ae4-990198853ee3/how_to_change_jump_force_keyboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a33c3bd-984a-4ab3-b639-9d0c560109f4/81405189062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7693f78b-070e-47ab-b9eb-39274cf68e46/dokuwuwom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8808973b-83b4-40fc-ab61-ea02d0a344e0/wacom_intuos_pro_medium_pth_651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dccb3a7-62ae-4fbc-a300-aca98dcd5489/to_shoot_an_elephant_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9644922-9a76-4bf9-b07f-0d8b888d91b8/wiseruluj.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_off000108ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CA 4708 bytes
SHA-256: 11d0c1bf7f82096f71d3a68a963069ff1cd2396bedfb0c5bec3705a8d1038551
font_01_sfnt_off000118d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D4 11320 bytes
SHA-256: 3abade008e354f96adc74c424b555bbfa45276c60b4a01c7bf9a723acad92a61
font_02_sfnt_off00013f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F90 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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