Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71e9f93ade22a7d…

MALICIOUS

PDF

78.6 KB Created: 2020-12-27 09:18:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f7b972dfa2bfc196b994796869fa1c6a SHA-1: 3042d999326e71e75719730a8a059132af54e5fd SHA-256: c71e9f93ade22a7da5de0b9f8aec2ca1e34029dad75c7c8548fbfc2e5eb69f93
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, and contains a critical heuristic for linking to known malicious redirector infrastructure. It also exhibits a PDF link farm heuristic, with numerous external PDF links, including the identified redirector URL and a Weebly-hosted PDF. The document body, though heavily obfuscated, contains text related to 'streamline english connections free' and the wkhtmltopdf application, suggesting a lure to a potentially malicious service or content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=streamline+english+connections+free In PDF document text
    • https://tetemubegogik.weebly.com/uploads/1/3/4/4/134443084/dilegixomikitutela.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/7q6kTii/baporunaweb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5fb6721535e6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/donarepemi/womens_vampire_costume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/907461d7-5c2b-4658-a948-05c7a8fa8f0a/tuesdays_with_morrie_quotes_about_communication.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e09389d-e1bc-4a8b-952c-cca37979c61b/4th_grade_civil_war_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/118ba502-c58b-417d-aa65-6ad5a64604a6/mogoronawowudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aefa75a4-0d20-4864-b53e-37a57ce9708f/60211860319.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/35427483135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baaa906f-d1c7-4016-b76a-5ec9daaee309/50557788675.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/jolofurajutumemaxajisinin.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/glucose_tolerance_test_nhs_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81e176c9-5c72-4900-85df-6f4849ebcf5f/85144014279.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/hip_hop_listener_demographics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e7c79f6-8f69-4fe0-ab03-f68e8d390724/need_for_speed_most_wanted_cracked.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BF 5396 bytes
SHA-256: 9404440070bd2e889424b31933c26afbdb02dec46383ca82b2e806c6d8e3b313
font_01_sfnt_off0000d3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EB 1804 bytes
SHA-256: 0992779df44557068499cb7985508dcef32e808d804ec31b4abee1e46ea88b1c
font_02_sfnt_off0000dd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD22 13176 bytes
SHA-256: 5f028f7ee112c812bdbe06d5f1d88c56fed6a95865ff841ef0c1b391db16ad37
font_03_sfnt_off00010730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10730 21928 bytes
SHA-256: 437ea0263fd46b68b1cee768d3b73195596fa838114fd4cf68adf521e62ee571

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