Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f699bda685c57d3…

MALICIOUS

PDF

76.4 KB Created: 2021-03-17 08:32:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8e510da89af19f96a766f6b5f14adc20 SHA-1: e09fe5ed6dd767fc854e412cd8903fb0714bbd0e SHA-256: 8f699bda685c57d3372dca31db0c53192b3cd99a56dc199a1f3d3c62cd3e981e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs and the ML classification point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/123?utm_term=ajay+devgan+platform+film+full+movie PDF link annotation
    • http://namelesssouth.xyz/lokuzujedozuxo2lhvi.pdfIn PDF document text
    • https://javesuput.weebly.com/uploads/1/3/0/8/130873829/wimega.pdfIn PDF document text
    • http://thepropheticapp.com/rapurupiboguzoxogawegakonau1ub.pdfIn PDF document text
    • http://mazers.fun/158354644493wzwk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372681/normal_6007c01305342.pdfIn PDF document text
    • https://rixijufufapug.weebly.com/uploads/1/3/4/4/134497528/5120367.pdfIn PDF document text
    • http://snapchat-alert.com/nidiworumuvosukabakl5wi.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/1692511.pdfIn PDF document text
    • https://fesinukovib.weebly.com/uploads/1/3/4/7/134715349/kofudo_kubugewibi.pdfIn PDF document text
    • http://setlyb.online/xomot3x3nm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370525/normal_5fff64416af1e.pdfIn PDF document text
    • http://big-ita.space/baby_toms_size_guide92q0k.pdfIn PDF document text
    • http://meetporte.xyz/67710215503b2ujj.pdfIn PDF document text
    • http://kengoru.space/hvad_betyder_reformermjdr4.pdfIn PDF document text
    • https://mezepobavufu.weebly.com/uploads/1/3/4/7/134717124/sowexalamev_nupewisagu_tomosizuxojatim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386609/normal_5fd2ded56f7e8.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/1db01066-f7d4-415f-9966-d1751a102a71/35908546446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/238dc950-b875-4afc-83fc-6a31153c34dd/is_it_allowed_to_read_quran_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cf03678-9283-488f-85a8-71e8b45c32b9/at_dev_english_to_bengali_dictionary_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afcd5c92-a467-4bed-a2e2-64943361e0fa/93063522072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34a7f8b8-1dd1-48d8-a10f-f10bbe161b1f/bogepukozof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b90144-0ecc-480c-a0e4-99e7f2804d99/kenmore_mini_ultra_sewing_machine_manual_11206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce1cb9c4-12ad-432d-8707-b2e5f18582b5/mcgraw_hill_math_grade_5_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c66f2cb-5207-44ff-bd36-3e515df330da/wixixurovuxedupoxajime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de3a9eca-24e3-4674-a010-7e7424c50a09/woxesupadupilo.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_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 5408 bytes
SHA-256: 10f70439e094e82562ad11224ef541033364b870316f0b71b5e9ed09eb172cdb
font_01_sfnt_off0000fef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 10908 bytes
SHA-256: 8346e48cbdc4b82655aa62586cda1b9a93041d6b530ebe45f9363ecf27045a15