Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8cd46d5d53c553…

MALICIOUS

PDF

75.0 KB Created: 2021-06-01 20:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 479414032a4a766cf53d52ee989ea13a SHA-1: ec3591864dc7602d2a56472b6fe08e58618d6311 SHA-256: 9b8cd46d5d53c5536a5a114511d6f4fe4f8f540024d2a8a121f0b045a15c9ce6
156 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 5

  • 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.
  • 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://kuzutuzo.ru/123?utm_term=romanticism+characteristics+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475559/normal_6026f2d6a0e9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455684/normal_60468e646fe7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380379/normal_6053b9a21b9b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_60400bfc13fee.pdfIn PDF document text
    • https://dinamulu.weebly.com/uploads/1/3/1/6/131637284/zufajuxebevaded-gidamiraxituto-duririke-fepebofifamasav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492240/normal_6002bde886c0f.pdfIn PDF document text
    • https://vefiwuzozubeki.weebly.com/uploads/1/3/0/9/130969791/zatowavenen.pdfIn PDF document text
    • https://ditujejogax.weebly.com/uploads/1/3/4/0/134042551/0004e.pdfIn PDF document text
    • https://jowapiwinutakun.weebly.com/uploads/1/3/4/3/134365581/2070766.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/f92fe9b9-1c92-4b81-b1ea-1483c7ac4bf2/java_se_development_kit_8_64_bit_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04bf21a6-6b66-45c7-985e-2306a8a94198/opciones_corresponde_a_tipos_de_sistemas_operativos_existentes_en_el_mercado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/579d4f5b-1b7e-4d36-ba4b-636531da4e7d/30514176444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1913245e-a745-4cd2-bb41-de34f06a7a47/sinuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a3bb87-4836-4c0e-9f41-3a548f218671/how_to_pray_the_rosary_in_spanish_when_someone_dies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb17ea02-f371-47d6-bc5a-710b543ad9b5/vujanawu.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_off0000ea4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 5368 bytes
SHA-256: 3ba72a496a417d867904fbbeb5acffe9e77017eea43292252bb2a77c532764a4
font_01_sfnt_off0000fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 10108 bytes
SHA-256: 29f8952d7067414e01759a51353d3a93ea59fae49ca4d8b4394c503aee91eda9

Open this report in the interactive analyzer, or submit your own file for analysis.