Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5422379664aa0c…

MALICIOUS

PDF

78.7 KB Created: 2021-03-06 08:00:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: bac3779b31e2ca491931963f38b2526d SHA-1: 2dcff4909006fae39aedc05c2f2974af4c76d598 SHA-256: 4a5422379664aa0c67e42d843ed9b459ef322fcf4b824859d3be36bb38c2bc78
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://ponafet.ru/123?utm_term=algorithm+for+solving+3x3+rubik%2527s+cube PDF link annotation
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/nimakinididenif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495409/normal_601175dec59ec.pdfIn PDF document text
    • https://vagapirub.weebly.com/uploads/1/3/4/6/134648019/rupaz_nebozu_fotirakudofomiv.pdfIn PDF document text
    • https://jerarovisiva.weebly.com/uploads/1/3/5/3/135332562/rinexuzimakepa.pdfIn PDF document text
    • https://zovipimisog.weebly.com/uploads/1/3/1/1/131163747/1993257.pdfIn PDF document text
    • https://sozuleku.weebly.com/uploads/1/3/5/9/135962343/sagamagexe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459058/normal_6034e35236631.pdfIn PDF document text
    • https://zupalopozaguri.weebly.com/uploads/1/3/2/3/132302876/soribumupowola-vegubufewolof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425487/normal_5fc693ee8f690.pdfIn PDF document text
    • https://jirogadipew.weebly.com/uploads/1/3/1/6/131606393/sorobuw_vukuseser.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422884/normal_60030c0a1c60c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401555/normal_5fc6c98e5a530.pdfIn PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/5867960.pdfIn PDF document text
    • https://tubidurifubadas.weebly.com/uploads/1/3/4/8/134885002/vonowadiluw.pdfIn PDF document text
    • https://zelowomuguzak.weebly.com/uploads/1/3/1/3/131379017/zoruxusovopa_xudofokagiger_rixuretakapapif_koxiv.pdfIn PDF document text
    • https://poteboxamakimef.weebly.com/uploads/1/3/4/3/134325651/wabekisiro_dosafunubog_xadanulatew_rilisi.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/77f9b312-7097-4a48-96a1-ca537e9ac155/how_to_play_2_players_on_mario_bros_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85b04b2a-76ec-4f81-806c-9ce0c324c5d9/kenmore_gas_range_oven_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc850e28-315f-4f87-88c4-4e2e6316d274/how_do_i_program_my_directv_remote_to_my_yamaha_sound_bar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9275594b-a310-4461-9ddc-66591e82027d/soyajoy_g4_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f5737e8-311e-41b1-a177-aca5a3b403d3/fudesasofimonijefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f4e7f69-38bb-4a53-bac1-b5000d06f799/tujupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5bf80d6-3e32-4623-bfed-27e44b37b740/78323807347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c54450f5-ba13-4aeb-a819-6e0d02243dd7/ejemplo_de_monografia_apa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dba2f3b-5eae-457f-9b23-edf05538125c/percy_jackson_books_set_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3cf9852-ed57-4d7f-9718-d7c6a853f677/yeti_microphone_setup_windows_10.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_off0000f6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 5604 bytes
SHA-256: 2497cf7554e600c0c3fcf70a4cf8e7d80236f405643057ca80aa7fac819cb8c0
font_01_sfnt_off000109df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 10312 bytes
SHA-256: ef7209ef68ce7e77b5305fc198d604332c80eeab995d7e8a283a0bae783cc0d8

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