Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf017e8b9125e94…

MALICIOUS

PDF

79.5 KB Created: 2021-03-04 04:23:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9a4fd231c2e77a9e97f6dc16bda7a0d6 SHA-1: 200d71168e11177c324e4de908a96f7009cdd7e0 SHA-256: acf017e8b9125e94a74db7570333d975957deb91ea0b2459e67903c1151513e7
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://maypoin.ru/123?utm_term=el+ciclo+de+krebs+resumen PDF link annotation
    • https://vomizovuzib.weebly.com/uploads/1/3/1/6/131637161/3999203.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/57336340473.pdfIn PDF document text
    • https://gazasajud.weebly.com/uploads/1/3/4/8/134879445/ed79b5e1b44.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/cef5ab6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504788/normal_6034468cc6af9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405925/normal_6006b778d8438.pdfIn PDF document text
    • http://rulavilev.iblogger.org/introduce_yourself_template.pdfIn PDF document text
    • http://xosavetevo.22web.org/faxifitufapuvijoxebidoti.pdfIn PDF document text
    • http://wabibanetu.22web.org/96701891505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388037/normal_6012e234750c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415950/normal_5fdc0f0217670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412887/normal_6022174843eab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rufonali/31214986409.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/vemoru.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/shape_recognition_worksheets_for_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/xopofibamokek.pdfIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/hummingbird_depth_finder_customer_service.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/92437003212.pdfIn PDF document text
    • http://migotugiwuzefez.epizy.com/lexile_to_guided_reading_level.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E1 5036 bytes
SHA-256: 492320ed7642fc652a9f1129302b05a3a0d81105ee93f95f26fc5376ab830afb
font_01_sfnt_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 12364 bytes
SHA-256: c0db48b4824eb8f173deee6779c1f56cf92afb59b00c39c5340e741deb880ade

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