Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5323813f11e7f80…

MALICIOUS

PDF

74.2 KB Created: 2021-05-18 11:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cdeca1f0f1ae13a7a8a92c7ddfeecd15 SHA-1: 5ec238013bfd98a7468c2a299f6705fcd333e007 SHA-256: a5323813f11e7f804b692bdd545eef2c4e2925db8d1678bc87e482edc1211f83
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=how+to+practice+tattooing PDF link annotation
    • https://pabafuneb.weebly.com/uploads/1/3/1/6/131607185/9224099.pdfIn PDF document text
    • https://vonorakukipi.weebly.com/uploads/1/3/4/7/134721252/jijitabawupaf-gitamowikaso.pdfIn PDF document text
    • https://walugudosesex.weebly.com/uploads/1/3/4/6/134608180/5887d86b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_604131ba7e405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375514/normal_60638c77eb165.pdfIn PDF document text
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/4c6ebc08530dd.pdfIn PDF document text
    • http://sewaluxedidijug.iblogger.org/igcse_biology_revision_notes_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423431/normal_6033502c5df55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lajixowamimexo.epizy.com/ac_market_pro_2016_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deb95fdd-56d2-440a-a6fe-0adec34c6576/how_to_clean_oster_fryer.pdfIn PDF document text
    • http://nofoforom.epizy.com/cadbury_report_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/pipe_fitters_blue_book_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/676a9b18-4a2b-4a6b-b3f2-1d727a905dcb/36050963475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d06b1e0f-7704-449b-8e13-77485fb6bb8e/dwg_file_viewer_online_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/63159730192.pdfIn PDF document text
    • http://pikobazu.epizy.com/microsoft_access_basic_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd989088-ccb2-4bf9-b036-40f16bfd55d1/nugozuwetawajuxoburodila.pdfIn PDF document text
    • http://ziwejozaz.epizy.com/cfl_stats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b824e454-9a55-4b7d-ba49-19cb24216525/boxariparifotuge.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_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 4944 bytes
SHA-256: 731670bab2c366adc1f72071f165a9979c063374a337553a8c9f09df801df139
font_01_sfnt_off0000f5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 11096 bytes
SHA-256: c982b1ab9caa0a7b0d96a1241ec7f3013db461944f45bfc4c7067e7852f2e034