Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51fd686d7ca5876…

MALICIOUS

PDF

68.9 KB Created: 2021-03-20 23:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8f185717662ccab1ff50cd446efb348f SHA-1: 983fa207df3ffb7e8150f79c37cf506d6d355c58 SHA-256: b51fd686d7ca5876761bfbc92aad0c9116d9d50f98f34402b5d2abfb21c005fa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://ponafet.ru/strik?utm_term=super+mario+land+gameboy+rom PDF link annotation
    • https://fefokepixax.weebly.com/uploads/1/3/1/4/131452923/sopezebokixux-povapeweli-nidowagigapopes.pdfIn PDF document text
    • https://vaxinukosiju.weebly.com/uploads/1/3/4/6/134625250/7046066.pdfIn PDF document text
    • https://koropiliful.weebly.com/uploads/1/3/0/7/130740252/kukofikufojijodosazo.pdfIn PDF document text
    • https://zumukematil.weebly.com/uploads/1/3/4/7/134716366/9757335.pdfIn PDF document text
    • https://fajizaxaro.weebly.com/uploads/1/3/1/3/131381717/8865618.pdfIn PDF document text
    • https://julubagarod.weebly.com/uploads/1/3/2/6/132695517/0b63f584f.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/cf7ba827-8627-4001-bed5-77bc2301f2dc/can_i_control_bose_solo_with_tv_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af0bfe07-fa44-4beb-953a-1a3a6fb6ab65/41985388725.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/invoice_templates_in_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/494827e6-ccc5-4485-97d3-b4ccf8ec1c94/pulubusakosemagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d5f4796-9faf-421d-b724-ab1c693b5b5b/bose_wave_radio_remote_control_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df5ddbfb-6db7-4fef-913c-1989398ea694/warm_bodies_trailer_reaction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e54edcf-2547-44f8-bf4e-6d2a09fcf713/47618513866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13f390d8-4778-46e6-af8b-69b5830e78de/26027925785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71c33490-aca7-4929-a7ac-cd27edf57ba3/82369381297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8cc01e9-4fa2-4a08-962b-bfd1ece06718/73961987926.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/35828769620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4d5fdf3-5c86-4c5b-b3c2-520662585437/which_best_electric_lawn_mower_uk.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_off0000d1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D9 5444 bytes
SHA-256: 99df67af7a39b553502728c29de89c418b97609ed979795cd9a10db27a438f98
font_01_sfnt_off0000e443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE443 9860 bytes
SHA-256: 72e242dd614bac04bd0a9cda506d15a1ee4aeba6d9db0f54f960b64e6c615a86

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