Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4fbb01d5dc9a79…

MALICIOUS

PDF

84.0 KB Created: 2021-03-09 04:03:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6b959c4fe9cb3bcd1cfb1c9ae27d8a1e SHA-1: 12e337368df884dd0f7351943d9e8ed8bbd0c249 SHA-256: cc4fbb01d5dc9a7981ab8732619981cb93b579bd92aca5c9900cf3dddbf04af9
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 0.9995

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://gimoguvi.ru/wix?keyword=what+are+the+factors+that+influence+biodiversity PDF link annotation
    • http://devlp.club/selanik_trk_kyleri_listesi6aqgp.pdfIn PDF document text
    • http://naykaryadom.fun/jump_rope_workout_schedulefnx3j.pdfIn PDF document text
    • http://samettemiz.xyz/panudesurauv5xr.pdfIn PDF document text
    • http://noksipals.online/354590972893f49m.pdfIn PDF document text
    • http://thesalle.xyz/bebas_black_font_freetlbdy.pdfIn PDF document text
    • http://znakomstva69.space/37756013170t20k4.pdfIn PDF document text
    • http://everydayy.fun/58074595186n0965.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/52785263910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81f37a40-85f1-45c4-b864-6ac9b678805f/9121680454.pdfIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_3774aeb87aeb45e0a475d28ab34342cb.pdf?index=trueIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_986c35d2bba7485aa611aa70ae186049.pdf?index=trueIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_92210b805d304c9790d6845575e684c9.pdf?index=trueIn PDF document text
    • https://4f0f5a39-0a2f-4cdf-b4e4-40a644fad8b9.filesusr.com/ugd/2024fe_d1c784a325044acca993b45517506fbb.pdf?index=trueIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_2f2a92f86ed14998927f129771beb198.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/688d3dad-ec4f-4e6a-91dd-179b81be5a11/84556410081.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/74116294112.pdfIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_2fcadbb300804a5eae2740f6afab8e62.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bagokiko/47914777831.pdfIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_4f0bded6b8204beb8e808fa012bcf2f0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8904406d-789a-4e16-99d1-b597ea551fc8/laduganizeros.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/23109244337.pdfIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_61d161666b794151a561164ddee29a75.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
    • 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_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 5424 bytes
SHA-256: 2e5c1285399367ca9b7d06b70e3c3693030c8181de9ac8b78133fec0ef390dc1
font_01_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 10536 bytes
SHA-256: 8a8f22033b2dd1a8833f8adfb83dc8e73771e8d7f924888cf546683f22d0eda8
font_02_sfnt_off000129cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CF 16848 bytes
SHA-256: 19226340d4ddf17eb2ebd2bcb9e6f644cd86eb55384cc8faa255262a850348e7