Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b5ddbe9abcb2a6…

MALICIOUS

PDF

76.8 KB Created: 2021-03-18 16:28:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9901271f0a75d6d3910fb4a1a80b1bfe SHA-1: 78ad3489318b67a1931a6c01c56d153cef3e04da SHA-256: 53b5ddbe9abcb2a6a67e5da3611a1c4e08f0c8ad8c9e0d875e9b0eb8d285948a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO spam or to redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to drive traffic to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=yard+machine+lawn+mower+140cc+oil
    • http://zagodutaf.getenjoyment.net/69937955848.pdf
    • https://vebajixumese.weebly.com/uploads/1/3/4/4/134483039/deebec.pdf
    • https://bofejaximolapob.weebly.com/uploads/1/3/4/7/134751884/7e5b83ae2.pdf
    • http://ganoget.scienceontheweb.net/oxford_arabic_dictionary.pdf
    • http://giwapozolaleg.mypressonline.com/wunenodujeritubuvajiw.pdf
    • http://viziziziv.mywebcommunity.org/lozugusamolo.pdf
    • http://fodefon.getenjoyment.net/place_of_preposition.pdf
    • https://wekisakalew.weebly.com/uploads/1/3/4/6/134617168/ef174.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nisoxow/sakuxebivumeti.pdf
    • http://redifigikutusoj.myartsonline.com/drawer_meaning_in_bill_of_exchange_in_hindi.pdf
    • https://s3.amazonaws.com/bupaxomu/videoder_apk_2019_premium.pdf
    • https://s3.amazonaws.com/dudurat/logarithm_table_1_to_100.pdf
    • http://movasedumanepe.onlinewebshop.net/74729249283.pdf
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_68f0c18ec3d44728a94493ca64276300.pdf?index=true
    • https://s3.amazonaws.com/fukezavazuj/zowogu.pdf
    • http://bivojeda.atwebpages.com/77550052675.pdf
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_29c746845b404fb4b197588c22874a93.pdf?index=true
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_cccd7a035eff4ecf933e56d1e57c8f1c.pdf?index=true
    • https://s3.amazonaws.com/jolituzoji/what_is_the_dogs_name_in_little_mermaid.pdf
    • https://s3.amazonaws.com/mikibetiv/zuzop.pdf
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_56b9e9301d614e0fa2550ded84f24a0f.pdf?index=true
    • https://s3.amazonaws.com/webipejonavuv/60899736693.pdf
    • https://s3.amazonaws.com/kewuxejikiwe/kathi_theme_music_in_masstamilan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea3c.bin
027a1aa7cbb204ed4d572892cb3f38d0d686ff5504a3bc6e3b08592c329278d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 5336 bytes
font_01_sfnt_off0000fc52.bin
1ca94023957c7972e81823ab6e49dad3e636d6bf08a73558f596e4bbcbf632b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 11692 bytes

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