Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac794fc2e882201…

MALICIOUS

PDF

86.3 KB Created: 2021-05-06 00:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 973e77461dcef7f744f16e1f502c34e6 SHA-1: a8097de4742b888cc0cd5c19c92b1fff557fe721 SHA-256: 8ac794fc2e882201be02f61f47d90ed733c2fd33a9b474b0809aac33051359b2
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to 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 explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://leonvi.ru/strik?utm_term=homework+is+good+for+students+essay PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426813/normal_5feebcb3e5ade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410952/normal_60249da18e73b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_6044758ba64f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391642/normal_602ba1f871b9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478670/normal_5fe52f5937400.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479435/normal_5fe4adc33dddc.pdfIn PDF document text
    • http://lnstagram-badge-verification.com/joola_ping_pong_table_touch_up_painthmi9c.pdfIn PDF document text
    • http://afracheat7.xyz/vutosototogzthse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379961/normal_605e193150415.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489993/normal_60092321ab5cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476152/normal_5ff82cfb758d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421612/normal_6060fa206ad8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467975/normal_605a41363f0a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465537/normal_604fcfef3e7be.pdfIn PDF document text
    • http://asia.kiwi/reading_comprehension_worksheets_forykdhj.pdfIn PDF document text
    • http://jadebey-x.com/mera_bhola_hai_bhandari_song_gana9cooi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415783/normal_5ff6aad513e42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412890/normal_6042cdadb2271.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/does_verizon_have_any_promotions_right_now.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/25622172011.pdfIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_a2b0d88583b14c81926141d592730f3d.pdf?index=trueIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_9c07591a87ab471c9427f646d8f90a98.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/12901388886.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/32132378902.pdfIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_1cb15b88b25d4b0388fdd28d0d2aafd6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/huawei_band_4e_manual.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_off000114fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 5416 bytes
SHA-256: 19b9125d53be5d7e9b70e6c502fe0dc10bc6be4e0b0db22647c85ceea6c14190
font_01_sfnt_off0001276a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276A 10584 bytes
SHA-256: 3b24166666ce129a0b24c9a12978a329990ba55dbb259ad2a8ceef9583372deb