Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cbf2a43dea7f34…

MALICIOUS

PDF

80.6 KB Created: 2021-03-05 18:20:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4af79cec010577bb233cf5593aaa65b SHA-1: da4de802c27c51a6b6cf0d7e2384d0278444f170 SHA-256: d6cbf2a43dea7f34e81cafa97054249cdbf8fbceb28f42268a1055ca729be0a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, a common tactic for SEO link farms or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=clasificacion+de+los+modelos+de+simulacion+pdf
    • https://static.s123-cdn-static.com/uploads/4387243/normal_60064f6e8a39f.pdf
    • https://volokosebu.weebly.com/uploads/1/3/4/8/134871595/refitowapukituludugo.pdf
    • https://zavelodenewiguj.weebly.com/uploads/1/3/5/3/135314669/54492.pdf
    • https://cdn.sqhk.co/jukelifawap/FhgvaQQ/duwojiferubadunawodikot.pdf
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/1107109.pdf
    • https://cdn-cms.f-static.net/uploads/4452835/normal_602afae5599c2.pdf
    • https://cdn.sqhk.co/tinodifozeza/7zOIYjj/grand_theft_auto_san_andreas_crime_city.pdf
    • https://nawopudupavipe.weebly.com/uploads/1/3/4/8/134856820/6bee95de59e6.pdf
    • https://ramowukegi.weebly.com/uploads/1/3/4/5/134508735/624234.pdf
    • https://static.s123-cdn-static.com/uploads/4425912/normal_6003f53c62263.pdf
    • https://cdn.sqhk.co/dewufidabo/hIgishj/sms_ringtone_song_mp3_download_pagalworld.pdf
    • https://static.s123-cdn-static.com/uploads/4496360/normal_5fe347ea58e19.pdf
    • https://rojigoziziza.weebly.com/uploads/1/3/4/4/134434225/25d2a92fd.pdf
    • https://sisareses.weebly.com/uploads/1/3/1/4/131454440/12475.pdf
    • https://funebaxap.weebly.com/uploads/1/3/4/3/134399245/sekikoxakipupukagiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://uploads.strikinglycdn.com/files/b6bb952d-e41d-4989-83f6-7dd6577658e4/how_to_address_a_letter_to_the_school_board.pdf
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_cf6b665c6a7c427aa78cecf9e76c5371.pdf?index=true
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_2e4bc7406739405f9cd95760dc859d48.pdf?index=true
    • https://uploads.strikinglycdn.com/files/96cdf975-f210-4958-b45d-6af6513211ec/how_to_type_alpha_on_mac.pdf
    • https://uploads.strikinglycdn.com/files/b5746895-2424-41fa-923f-d64207043235/44450601312.pdf
    • https://uploads.strikinglycdn.com/files/edd223de-df62-407a-8202-f01ea840744a/larevopudatiga.pdf
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_4abb7617736f471d80e0e944aed8a4cf.pdf?index=true
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_a762453c835c4779ba7fbfd3282bce46.pdf?index=true
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_ebe35382fdc4489ea1a5d8a5cf41804b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea35.bin
b2d33d449e66f929d4f405e72fabecd533270761579e04f301bad3dbc95303db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 5108 bytes
font_01_sfnt_off0000fb79.bin
fedb2f189c8480caff3900ca2f65861ced9dc6f650a3cc8a6f896dc1a923fdab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB79 6784 bytes
font_02_sfnt_off00010d96.bin
970fc73c46da02eb8a8ce2c341980ff5e445b88c0e3f858e22c06821d0d2da73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D96 11556 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.