Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d486b8e13175ac3…

MALICIOUS

PDF

77.6 KB Created: 2021-04-12 09:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 71944463002083352c511170777991c4 SHA-1: 490eb2188b76952d9617085c73d09ab4f9bf36c0 SHA-256: 8d486b8e13175ac3cd0956e234a89d60b15651fe1f96b5639352c58c3e643c22
186 Risk Score

Malware Insights

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

The PDF file contains a large number of links to disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://maypoin.ru/strik?utm_term=modal+verbs+test+multiple+choice+pdf PDF link annotation
    • http://nakodinita.scienceontheweb.net/saxagorezogefusi.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/zijez.pdfIn PDF document text
    • https://finikepimu.weebly.com/uploads/1/3/4/0/134017618/2882077.pdfIn PDF document text
    • http://timelessdecorum.com/1800189022973cqq.pdfIn PDF document text
    • http://center-san.ru/gidufazatifuruxipuwujotug7m3.pdfIn PDF document text
    • http://kunepuvobimamin.medianewsonline.com/computer_knowledge_free_download.pdfIn PDF document text
    • http://arnautmebel.ru/how_to_set_motorola_walkie_talkie_frequency7mexy.pdfIn PDF document text
    • http://kubopunowazi.22web.org/niv_bible_file_free_download.pdfIn PDF document text
    • https://bomejafir.weebly.com/uploads/1/3/4/7/134725936/mezimerirote-towidu-vorejet.pdfIn PDF document text
    • http://kidupat.getenjoyment.net/20136464698.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/water_borne_diseases_in_pakistan.pdfIn PDF document text
    • https://zepazilarewar.weebly.com/uploads/1/3/4/3/134310653/73e25719a79816.pdfIn PDF document text
    • https://pixofanipadolu.weebly.com/uploads/1/3/5/3/135326367/1668016.pdfIn PDF document text
    • http://bupetud.xyz/sony_handycam_dcr-sx63eh2jl6.pdfIn PDF document text
    • http://dommasters.site/ezgo_robin_engine_parts0d034.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://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_183736c70e434ad2abec4db55f04db58.pdf?index=trueIn PDF document text
    • https://cfae799c-d04a-4395-b2c2-700dffd2ed5c.filesusr.com/ugd/15504a_2ab9725f85a540c3bce76cb5dcdb6166.pdf?index=trueIn PDF document text
    • http://ludujefu.epizy.com/small_business_administration_joint_venture_agreement_template.pdfIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_8c1fd5adb12b4e9cb9a2728659961ed7.pdf?index=trueIn PDF document text
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_b2880d0225314e1eab0da0c60e184289.pdf?index=trueIn PDF document text
    • http://duginuj.rf.gd/telegigevulebirodudugi.pdfIn PDF document text
    • https://e905e09d-7ddd-4aab-833c-73500e817873.filesusr.com/ugd/f4c08b_6958a3a09dc7411db90786c4a4877a60.pdf?index=trueIn PDF document text
    • http://nojerodupojelaw.rf.gd/kowodup.pdfIn PDF document text
    • https://eb7ae0bc-69c2-4833-8adb-ed465737bb77.filesusr.com/ugd/23493e_a64e7e450e8d45c49b43a35097ee76a7.pdf?index=trueIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_a89f59a6aefc431986c059d233a8bf94.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_off0000e30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 5376 bytes
SHA-256: bcbff37ed5d07ea0e9f8b6f69b66b7aa6669233df11270ffb4c44e1386ee8a32
font_01_sfnt_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 10968 bytes
SHA-256: 40263d0d9744b2a0eb4822e7a497cf81491baf4c7785983be6d60bdc4330ce8b
font_02_sfnt_off00011ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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