Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b5dcb6070d84f1…

MALICIOUS

PDF

74.9 KB Created: 2021-05-30 05:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 422c056b9f9da544a210794d8c276aa8 SHA-1: 0c795bac8581b9b8dba8e5df38efbc459c49e724 SHA-256: e6b5dcb6070d84f1c0015e369647ce38c28ef6e1dda36ce6ceca99a35bc6a6de
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 0.9996

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://golowaki.ru/123?utm_term=yentavadu+gaani+movie+songs+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381536/normal_5fea0bfb50657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412767/normal_606ad62288436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450639/normal_5fe8265f5f653.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410415/normal_605abbe9427b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425227/normal_605f4e7c75423.pdfIn PDF document text
    • https://tumotasefon.weebly.com/uploads/1/3/5/3/135317172/4305044.pdfIn PDF document text
    • https://zivogozupitis.weebly.com/uploads/1/3/1/4/131406352/valikeposaxugefor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_6012a2a2d36fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372355/normal_602506181f745.pdfIn PDF document text
    • https://zenibevakuziva.weebly.com/uploads/1/3/0/7/130739170/furikumivunezi.pdfIn PDF document text
    • https://kosazuritejozu.weebly.com/uploads/1/3/0/8/130874521/4637744.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486963/normal_5ffb4721d081e.pdfIn PDF document text
    • https://bivamotitujodo.weebly.com/uploads/1/3/4/7/134712473/lazosozub.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/77a4dace-fde0-4e22-b197-28db38d50434/betty_crocker_cookbook_first_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/505e2a81-216d-4d56-bb90-39ba2033884f/what_is_the_best_budget_lawn_mower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ada918-ffbf-420a-8924-910781204779/parking_near_wills_eye_hospital.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57cd2915-e235-4731-944b-b3af0f77344e/xoxaneg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe0df82c-97d6-4fcf-83fb-2087a908d4f0/38251477543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f734ebe-aab8-4c86-92d7-8b58e43cb3ae/50439588051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2208e531-1b35-4f1d-8c16-67c06b35a121/what_is_a_meet_and_confer_declaration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/331f1309-9f58-42d5-bf81-fbf03f4f7dca/hoja_de_rifa_de_100_numeros_para_imprimir.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 5216 bytes
SHA-256: 2019f806827ed4706453bf468300ef4e2f5bcdbdb30226d2d6e15599114e9d20
font_01_sfnt_off0000f906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 10940 bytes
SHA-256: d3362f6629b5963ba732750b50e1d3f628fddba0a5dcf1b4b81a63c226006c6c