Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb153014358752b…

MALICIOUS

PDF

75.0 KB Created: 2021-03-05 14:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b6353277cd00d632b64351f3b0f7f651 SHA-1: 5fceaf757441f63b25f67c696cb47f9625ae984a SHA-256: eeb153014358752b7a1a51c53904b2aa23b6316a72c78fff31b9670329f9d9ea
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-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/wix?keyword=yahtzee+with+buddies+free+bonus+rolls PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459059/normal_60140bd462a9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_601eed6d3f1f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491665/normal_6019f391bed8d.pdfIn PDF document text
    • http://jokeriz.22web.org/frigidaire_fghc2331pfaa_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419205/normal_602dda15a8eae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_603a06f18464f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447663/normal_5feb0973ee8ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_6b4cb6d3be3e44799d182e403185c97e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd4a6a8f-d435-40d4-a093-5ea4705952bb/bhagavad_gita_15_chapter_in_kannada_with_meaning.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_08ab6fbb855047b5b94515f2a3025009.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a83e0a70-1c51-462a-9d39-bf3bf7e19605/english_grammar_online_exercises_tenses.pdfIn PDF document text
    • http://gokemebazeroxe.epizy.com/sufeloxinezafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e5c1db6-9982-4249-8d88-14bcbd6c5801/when_rabbit_howls_quotes.pdfIn PDF document text
    • http://dexidije.epizy.com/bodhidharma_history_in_malayalam.pdfIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_4a4cf797266c44e28f670e7efd3f2c3f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6be2ae9-43ea-46f4-8f09-6be5be147f8e/94075057279.pdfIn PDF document text
    • http://satimizatojuge.rf.gd/25433129438.pdfIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_288d0d6bc4ba410a8c85d587680364d8.pdf?index=trueIn PDF document text
    • http://depesup.epizy.com/35153665305.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_1b5c817e64464be19ea8f0f3e93fb81e.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_65b8d388e8b346d2a52ff10e9d0c6861.pdf?index=trueIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_60c764efea6a42618568df8856148fa4.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_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 5240 bytes
SHA-256: e14a08b03f37efe7503bb809a0788f98fa70f151599b683d8719a61abcc2a52a
font_01_sfnt_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 10732 bytes
SHA-256: e05534aa6600ac3dfcf4104c1af4158dd15843771d200dcb0540fd796208ac6d