Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ba11438a90a855…

MALICIOUS

PDF

93.1 KB Created: 2021-05-27 12:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e4a8e249504e40453e452adedac9cba9 SHA-1: 906efc08b663884569d1d570f96ab1b96a53fb48 SHA-256: f0ba11438a90a8556101e8ded627ac4170a054cd60dff90f6f9bd33311475fb6
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=contexto+de+la+obra+al+que+ingrato+me+deja+busco+amante PDF link annotation
    • https://sapatipiragibo.weebly.com/uploads/1/3/4/7/134708637/df16358.pdfIn PDF document text
    • https://bulipabuwalo.weebly.com/uploads/1/3/4/1/134131868/zutawiwazidite.pdfIn PDF document text
    • https://xuxuratedagofat.weebly.com/uploads/1/3/4/6/134644764/4281082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374980/normal_602825ac8349f.pdfIn PDF document text
    • https://gutavavoz.weebly.com/uploads/1/3/4/0/134000423/8f4287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501201/normal_605ca34e96b80.pdfIn PDF document text
    • https://pudemozesuvetit.weebly.com/uploads/1/3/7/5/137515762/mavokenife.pdfIn PDF document text
    • https://zujamapetot.weebly.com/uploads/1/3/1/3/131381682/soveb-kalubinubekeje-dominawutuzav-levitojilagojet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369160/normal_5ff76456b1fac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482847/normal_600c70e537d9d.pdfIn PDF document text
    • https://guzesunidami.weebly.com/uploads/1/3/0/8/130873942/1873484.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/mubujogiwigexivowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_6048f7b0c960d.pdfIn PDF document text
    • https://dabawide.weebly.com/uploads/1/3/7/5/137511183/6927880.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/d4ac9148-47e8-4a41-8b35-f883a853ae5d/othello_act_1-5_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20925b41-9bd0-4fe9-a27a-0c372b8bd295/92729756877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40fd95a4-ea74-4534-bdc5-8d7a15b82690/34525363725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c36add96-e056-4b95-b8ce-4e7024012272/harry_potter_and_the_half_blood_prince_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c021acda-e2da-4950-af51-c78fe9a8b756/42610260989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e62819f3-40de-4a8c-be23-cc325937fbe6/oxford_picture_dictionary_online_teacher_resource_center.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c4c1f0d-80e9-46f9-83fb-f389c1ba836e/77141585906.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_off00012895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12895 5572 bytes
SHA-256: 17bbeb573b9be058a5d3ec259b07e62585859010fadbb83f05038233644c3e75
font_01_sfnt_off00013b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B69 12740 bytes
SHA-256: 409607a51571b5ff6ea96edee7c4adabb55402ddd69cac251922ba8103c6df58