Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e11da2d4b7d0dc…

MALICIOUS

PDF

82.6 KB Created: 2021-03-14 02:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 36956e46d7edb462cb52e9e8702074bf SHA-1: 92e1bcb866aa8468f96476f1e93b1f12e5dc409f SHA-256: 83e11da2d4b7d0dc316c82e453a90ce8af2300650332016b59845d0fd46716f9
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 0.9996

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://zajinet.ru/123?utm_term=acrostic+poem+template+for+names PDF link annotation
    • https://dobetabuzaduguz.weebly.com/uploads/1/3/5/3/135312815/1455085.pdfIn PDF document text
    • https://kurixaxewa.weebly.com/uploads/1/3/1/3/131383664/7223125.pdfIn PDF document text
    • http://sodowetan.mywebcommunity.org/university_of_south_carolina_map.pdfIn PDF document text
    • http://retamos.mygamesonline.org/76760994806.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/start_sentence_with_day_of_the_week.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/90133625701.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/jesalejijefofovunazagixu.pdfIn PDF document text
    • https://nobarolibefo.weebly.com/uploads/1/3/1/4/131407117/suvoseji-wulowo-vukazokov.pdfIn PDF document text
    • https://vawisopikev.weebly.com/uploads/1/3/2/7/132740649/tevoj-vipawuno-gozaluwaxesa-vonudofuti.pdfIn PDF document text
    • https://kenaveduku.weebly.com/uploads/1/3/0/8/130813649/sovosovusuboxegogi.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/geferevujixaxexixogonim.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/2cb0e2fd-c624-4021-8101-7bc89264d1cc/kotar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93034171-27e7-46cd-8e0f-f479f969e5ab/32141135517.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/hbr_guide_to_project_management.pdfIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_40b38acd6bb24d6b87090200958f7640.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/womirofop/kinesiology_taping_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c8456e8-b46b-4ae8-9927-f1ebc8a62d1c/social_media_marketing_a_strategic_approach_2nd_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc67fd3-23f9-47e2-b9d5-717d36e6c241/36217841628.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/exception_in_c.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_6f5ddeda2e9e41e4a71494c44945526a.pdf?index=trueIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_f28ad854e72748b5b60a0c35ba8568f6.pdf?index=trueIn PDF document text
    • http://mifedisiso.atwebpages.com/gonidularufuvusuzid.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_off000107b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 5152 bytes
SHA-256: 58e6424d565fa6d390a605ebf92702ee32f51851d0572161fb0edd00bbcc54ed
font_01_sfnt_off00011929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11929 10632 bytes
SHA-256: 57313468beb0224e74c774d2053c9c5897ba1608e7261904612d8e7ef49d4019