Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6de1bb9de55ad42…

MALICIOUS

PDF

77.5 KB Created: 2021-03-27 21:59:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e91eaeda6d45b3c8dbd65eed210f46df SHA-1: ed511cb129b47d9920f7db2db4791c187aead26a SHA-256: c6de1bb9de55ad422c50531d3b4f0e19592d3da40e21e6b7fc13330b472775ec
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for phishing or distributing further malware. The document's content is obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=ionic+bonds+worksheet+answer+key PDF link annotation
    • http://creditreportusa.info/wonadiwigebht22j.pdfIn PDF document text
    • https://cdn.sqhk.co/kunutewiwit/i6jaNyV/sns_nails_near_me_open_sunday.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/dmZiiS7/quick_contact_widget_android.pdfIn PDF document text
    • http://rubka.space/19470480857ajf7x.pdfIn PDF document text
    • http://vovpomnim.ru/58650997517uwjzl.pdfIn PDF document text
    • http://dnepr24.info/beboncool_gamepad_apkxl83a.pdfIn PDF document text
    • http://crawlmqyu.space/16559835042cdzk7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6b551870-9d71-4c88-87ac-30bafd697196.filesusr.com/ugd/b27e13_40e75ea88e92436b93b2e2602e5edbfa.pdf?index=trueIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_614426aad425487798d86656f0362044.pdf?index=trueIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_0142e5536c074b25966630c748f8a145.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c61c68-8969-420d-a0af-c39ef057858f/270864247.pdfIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_44356af4d9464aa9be45235d74cee0ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb01f3fe-6590-43ef-8886-c25c8f19e420/vakulebur.pdfIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_5121e8853c824044b222f49d6e558c32.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f9e284-e968-4e93-9b02-362a1bb99e10/what_is_big_data_in_health_informatics.pdfIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_1242a5556bd34d01893e672d06684d6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/215d79bb-d2ed-487f-9263-82d9a3451dc8/self_determination_theory_competence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbcb3368-76a0-4966-bbe3-199786a1e8a1/zugaxejonimoxusoko.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_58beb81707cf4fdd85e26e5c72e14f11.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_off0000eef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 5332 bytes
SHA-256: a56cf53c8848403b323fd3a1c4609dedc7cc2051e4e56b54ad0f8990e0fb20cc
font_01_sfnt_off00010126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10126 11576 bytes
SHA-256: e6253efd8a41ecf3f51286f8852f6feeace0cc4ec6df4a61ec51604cb905e6c4