Malicious PDF — malware analysis report

Static analysis result for SHA-256 8719eb59f98fe42d…

MALICIOUS

PDF

88.3 KB Created: 2021-03-08 21:18:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d23cf7dc988d0f7d725bb92c93cee396 SHA-1: 9dd9e5e710d69d87638c0a3da4991d4e4a8a5e5c SHA-256: 8719eb59f98fe42d4855d049b618a72fb34c5b35871f1b2ed64d59d86a304dc3
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded links to external PDF files, many hosted on disposable domains, suggesting a link farm designed to distribute malware. The presence of a 'Cyrus installer android' lure and a high ML classifier score further indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=cyrus+installer+android PDF link annotation
    • http://abreudesigns.com/best_group_discussion_topics_for_studentswa4cp.pdfIn PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/pitaj-fokerimawipe-nonebuwuwutit-sijasobenodinaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388598/normal_603d3b3b12f7e.pdfIn PDF document text
    • http://semengergel.ru/how_to_break_into_pagesrfvou.pdfIn PDF document text
    • https://tajerupabud.weebly.com/uploads/1/3/1/1/131164315/wakowidej.pdfIn PDF document text
    • https://lenukadizavubo.weebly.com/uploads/1/3/4/4/134492519/98e6a368662.pdfIn PDF document text
    • https://sikegupul.weebly.com/uploads/1/3/4/6/134681682/6755705.pdfIn PDF document text
    • https://lipuxavevafip.weebly.com/uploads/1/3/1/3/131398459/172337.pdfIn PDF document text
    • https://subokolabipu.weebly.com/uploads/1/3/2/3/132303028/niven_gowexuf_xafawiniwijeb_zinofaralado.pdfIn PDF document text
    • http://smeshnoykir.space/zigifunureroczviw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_602de40ee9625.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489981/normal_60279fa33c615.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459785/normal_5fde7df1d08d1.pdfIn PDF document text
    • http://instas.site/61634768387qtk2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c1fb9628-4c88-4a2e-a2ff-a46ab5cf6868/32212427243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf52ac52-aa02-4209-a2a0-67ed59ba08b3/fojuvexiburupajemesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f4c9a0b-4c83-4239-a163-74d440d2e9da/can_a_rental_agreement_be_cancelled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b2b3805-0351-4cf6-8a20-d4a3f8848f05/nuxonozokikasabitebono.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off000110ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CE 4824 bytes
SHA-256: 96206c4bf1e8fb3b35ecad5e99a35baec6de30428cfcad5c73b65ff32c3cf87c
font_02_sfnt_off00012148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12148 10592 bytes
SHA-256: 77551eb18867de21c66897ea1094f737b92f1ba0c21eeb990b37b6df632563b4
font_03_sfnt_off0001454a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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