Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62dd26398289d4a…

MALICIOUS

PDF

78.5 KB Created: 2021-03-06 07:03:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 8cfe9fceffac63b35a57fc10a7a6934c SHA-1: 08818fad1ecdfccfe6fd2186f4aff0ca28d40804 SHA-256: b62dd26398289d4a4b0cde37b275886aeffd28f60b37eda4580131bf75de26ab
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains a large farm of external links, many hosted on disposable domains, suggesting a link-farming or SEO manipulation scheme. While no scripts were explicitly extracted, the presence of numerous external URLs and the overall structure strongly indicate an attempt to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=does+yamaha+rx+v673+have+bluetooth PDF link annotation
    • https://butevexonukuzi.weebly.com/uploads/1/3/2/6/132681970/2287815.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381302/normal_5fd0462a9eeb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415292/normal_6039492955ff4.pdfIn PDF document text
    • http://tetiviguxawik.getenjoyment.net/jusijagawig.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/lyrics_to_cant_stop_the_feeling_justin_timberlake.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/what_are_biblical_character_traits.pdfIn PDF document text
    • http://rofuxipof.mywebcommunity.org/dymo_labelwriter_450_turbo_desktop_label_printer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_6042c80aa642b.pdfIn PDF document text
    • https://xisosisudotaju.weebly.com/uploads/1/3/0/7/130738948/tokesot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jofanemapax.epizy.com/nasezebirig.pdfIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_3c6fa63113df4edb9420c3ef7c7b76b5.pdf?index=trueIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_814ba3f25ec34800ab515722a460e8df.pdf?index=trueIn PDF document text
    • http://foxebunuref.epizy.com/vakamoletidug.pdfIn PDF document text
    • https://a96bb073-a604-4091-b2b3-8ecc1f64d3e7.filesusr.com/ugd/e3c460_c59324a004ac4cccbe01e4af4dfcd342.pdf?index=trueIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_13067d2144714b7ba4da25d08ee3166a.pdf?index=trueIn PDF document text
    • http://misilimazopo.epizy.com/internet_marketing_manager_salary_philippines.pdfIn PDF document text
    • http://xomutojekes.myartsonline.com/what_is_function_of_kernel_in_os.pdfIn PDF document text
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_3b34751b28bf4c80b3e7ef352418b58e.pdf?index=trueIn PDF document text
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_19b3153103c1412cba9bfc9e8bb70464.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 5692 bytes
SHA-256: 7512f3b95707b046c3950b6750a55167e2f286704ee4d46618afdff295db060f
font_01_sfnt_off0000fe3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3E 14764 bytes
SHA-256: 13dbc1cb060572a908abf027a6f459b48a9e554e629a00ff53f463163240e881