Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaff90f3cdec5966…

MALICIOUS

PDF

82.5 KB Created: 2021-03-15 03:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0c93ceb0557898a97b2ae9dc42931186 SHA-1: 11561e09f75ec05a2c94e40656e8a6c64e82e8dd SHA-256: aaff90f3cdec59668b6cfe38feec340d10486e66471b4f64cf6f0446c7c6c399
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 0.9995

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/123?utm_term=self+attested+caste+certificate+format PDF link annotation
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/mozikimete-lolewomal-bodexibajoz.pdfIn PDF document text
    • https://posonapajisosi.weebly.com/uploads/1/3/4/1/134108616/nujuvenizegebu_zinoguxijuxiwof.pdfIn PDF document text
    • https://zuxibonidape.weebly.com/uploads/1/3/4/8/134889984/dupusorevixojew.pdfIn PDF document text
    • https://falizuzu.weebly.com/uploads/1/3/4/5/134506804/sagarifij.pdfIn PDF document text
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/ace0ac064cb06.pdfIn PDF document text
    • https://wusuritod.weebly.com/uploads/1/3/0/7/130739885/5768182.pdfIn PDF document text
    • http://visunuduxat.mypressonline.com/what_do_san_juan_mean_in_spanish.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/how_to_attach_document_in_word_2020.pdfIn PDF document text
    • https://vigajinid.weebly.com/uploads/1/3/4/8/134889024/e9f794.pdfIn PDF document text
    • http://gazizelasama.getenjoyment.net/98152974234.pdfIn PDF document text
    • http://ketaton.mywebcommunity.org/synonyms_worksheets_for_grade_2.pdfIn PDF document text
    • https://fafevidelaxikez.weebly.com/uploads/1/3/4/4/134481631/63572.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_5b06c5dbc7d24c6197e524f9cbda3f19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6833cec-3f3a-4929-bb39-04c6a2572505/rewufafit.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_2578a3b22932465ea015115149507909.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d30d6b63-e988-44eb-943d-122529653109/revolt_against_the_modern_world_xurious.pdfIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_f8966f2429ae4b7e8476db66596ec424.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d9f71cf-c8c5-42fa-83ff-9fc9427295a0/troy_bilt_5500_generator_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1fb7a4d-ce51-4624-865b-83630f8be8d7/71718955146.pdfIn PDF document text
    • http://disoluje.myartsonline.com/18976021452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83923447-ea93-4469-ac5a-4fbab4297e2a/what_is_the_bible_not_in_chronological_order.pdfIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_7a59c86cbbc846679ace1fdd3c517132.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 4952 bytes
SHA-256: 89776b0d25068b772ca6e57f805b8870dce244507aeae033106718a2845b474d
font_01_sfnt_off00010911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10911 10932 bytes
SHA-256: 7006c661cd956782024be3bddaf165a679f5b6ca3bd393e47f0c978ef17382a9
font_02_sfnt_off00012e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E35 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2