Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9b23b25d26c097…

MALICIOUS

PDF

75.4 KB Created: 2020-11-17 17:12:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f43b95648a1061915e7a3f41e6386e90 SHA-1: d7d93063c1889b772f56dd38049393de07e84ed4 SHA-256: 0e9b23b25d26c097dbfe9fe8575cf4694c9a59b2f2e4b8151f91705bc43807a1
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 0.9997

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://traffine.ru/123?utm_term=canon+mg2220+ink+absorber PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409113/normal_5fa2ef205c6e1.pdfIn PDF document text
    • https://dawiganolakegoz.weebly.com/uploads/1/3/4/3/134367714/8678924.pdfIn PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/rovubalate-suvusonolux-kemuzibumovarix-daketidijo.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/73440c3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393209/normal_5fa3970c8507f.pdfIn PDF document text
    • https://kupifibadobibe.weebly.com/uploads/1/3/4/5/134512214/wadupidivanofudibuba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f8a610364015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411917/normal_5f989994553ee.pdfIn PDF document text
    • https://dogiwubof.weebly.com/uploads/1/3/4/4/134400908/mugufa-sibopuwuseteme-wasixujula-luloro.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/047eacc5-3eca-4301-a0f6-78db3b0070bf/54522356384.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/89241218684.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/protein_structure_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/giribaluzuzojubiwekara.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/dufegefe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 5184 bytes
SHA-256: d307963eb075f50f717ce3cdc5f3bd489b235fdcbaf0a167e1e2aeace8ff3595
font_01_sfnt_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 10852 bytes
SHA-256: 5d1b62f4484c31a624d4225e3f95602617ae46286da3be590f0a71dfc9cc6163
font_02_sfnt_off00011251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11251 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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