Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da45ac3ba9240a7…

MALICIOUS

PDF

83.6 KB Created: 2021-04-01 02:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6c8f1fb85729668d9570f3dfed7e2753 SHA-1: b28c4f64928a31fbd46b8689b9d401af1f5fc2bc SHA-256: 2da45ac3ba9240a75142db05490186c785e37a7c798e651d3189d1fa419181a3
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/123?utm_term=netacad+cisco+packet+tracer PDF link annotation
    • http://dobuwiwitevotir.sportsontheweb.net/xazunatigonabaxi.pdfIn PDF document text
    • http://pimavegi.22web.org/tamemu.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/75036571056.pdfIn PDF document text
    • http://sokuzise.iblogger.org/free_business_brochure_templates_word.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/pisuwoxivediguji.pdfIn PDF document text
    • http://autoupgrade.website/51737550592si8ta.pdfIn PDF document text
    • http://vseti.life/design_sprint_methods8z7xu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xeregolipota.epizy.com/lopi_wood_stove_blower_not_working.pdfIn PDF document text
    • http://puvepedep.epizy.com/bulozikisik.pdfIn PDF document text
    • http://murapimopavopa.myartsonline.com/metodo_descriptivo.pdfIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_f1b04e6f22c348e2abe0ef4d15d3488f.pdf?index=trueIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_c34a74bd5ba94743afd79afeccb4e3d7.pdf?index=trueIn PDF document text
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_83668b3c9dc645ddbedcc0f4575eb2ef.pdf?index=trueIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_bafe44403d02467b83326473a6477a48.pdf?index=trueIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_8082c64472b0437d94a929fd682cade7.pdf?index=trueIn PDF document text
    • http://vedixemalirugi.atwebpages.com/denon_avr-x1000_av-receiver.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/human_resource_management_ppt_template_free_download.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_6274c6fd0df0478eacb4c8c5d106b2f8.pdf?index=trueIn PDF document text
    • https://0d801636-e20c-47cf-9654-f2c4f0d28fb9.filesusr.com/ugd/2e7c9c_94f7400a8a3047329e14315ef50d60c9.pdf?index=trueIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_75ad4029b99648d28239d6da70bb9539.pdf?index=trueIn PDF document text
    • https://677f84e8-2a3b-482a-8721-58d714100356.filesusr.com/ugd/086aec_61d27f80e61543539875092b6ed18a38.pdf?index=trueIn PDF document text
    • http://zogosugo.onlinewebshop.net/32775671773.pdfIn PDF document text
    • https://527ed197-5826-4432-9c89-449afa9d705e.filesusr.com/ugd/65ef70_eba966342faf4d67a9edc68220e2f82a.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_off00010984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 5068 bytes
SHA-256: 20aadf329203fbe22f2d1c960212d02dc73cd80a412e693cc4fb07ddde3a4198
font_01_sfnt_off00011ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD4 11144 bytes
SHA-256: 62b35acfcd1fad1bde4649c868666f255a8a73346d6b208a60d17f6ff0e74cf0