Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8be36030fa96af…

MALICIOUS

PDF

77.6 KB Created: 2021-05-03 18:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 503dab1a2340b1928388e118f32759f2 SHA-1: df969c07b2fb8a77086fd8e235b098945c41d86e SHA-256: 9e8be36030fa96afae7e6508a746be10d7b6c51328071a19a2ee74f0cd99d7e4
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 0.9997

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://bologen.ru/strik?utm_term=elm327+mini+manual+pdf PDF link annotation
    • http://pixujuxe.mypressonline.com/63788674959.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386074/normal_5fc6cd44c9536.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/what_are_some_examples_of_conflicts_of_interest_in_healthcare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405195/normal_604a2e3cc8661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426967/normal_60252778eaf16.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/aa4ddac6-1669-49fa-8b2d-4705034bcbff/mubavakapixibagunudufus.pdfIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_072174f3ac504f55b93b4c5c6e390412.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d9fb65b-bc76-43c9-9a87-5ba0cf2865ed/kenadada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e22d098-990d-40fb-93d1-ef6ec2da3d9d/detozilijitutoselosovi.pdfIn PDF document text
    • http://tososite.onlinewebshop.net/nurullah_etin_roman_zmleme_yntemi.pdfIn PDF document text
    • http://sajavaganapa.epizy.com/will_fifty_shades_darker_be_on_netflix_2020.pdfIn PDF document text
    • http://saninov.epizy.com/formule_cordialement_en_anglais.pdfIn PDF document text
    • http://wuxegutazaxelox.epizy.com/19529779955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b8e829-cc25-463c-85fa-5a97a9069c02/29689671118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5b815d1-68cb-4e77-b287-a29ecdd0e8d7/laxovuwejagalodazijunu.pdfIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_dca9f8ab9ab44657b18973a4b6805945.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a5deb0a-e9df-46b9-b7ff-7b8fe67b0443/what_is_the_most_difficult_interview_question_to_answer.pdfIn PDF document text
    • https://f270a619-8d23-4dc9-95fa-a4320df4b75e.filesusr.com/ugd/7bd364_fa07cef2638d4e609b5477ad786f23c9.pdf?index=trueIn PDF document text
    • http://lobusiwogix.rf.gd/balaji_tambe_garbh_sanskar_book_in_marathi_read_online.pdfIn PDF document text
    • https://badbb018-ab4e-499b-b788-960949b82e3d.filesusr.com/ugd/4f4c56_f2a37ce8528f46ffb16550808e6545b5.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 5244 bytes
SHA-256: ff038525ff55ec6d7c9913cd756d1c38b0dcc557bbc845c05400c4699175f03a
font_01_sfnt_off00010211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 11132 bytes
SHA-256: a0d6a87704da7b143d67ff269c7f8d801f85dc0b27347ac87e26bf9b19fedfed