Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be2504851fe0fdd…

MALICIOUS

PDF

71.1 KB Created: 2020-12-14 10:36:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a714d18f99dbe655c1bf94b0e06d98b6 SHA-1: 127766d3076a84e8596cd83345f7d782143ac0a4 SHA-256: 5be2504851fe0fdd6de639c613ec5ba2c7f78ab28863b6134985990a3606da5a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains. The presence of a malicious ClamAV detection and a high ML score further indicate malicious intent. The embedded URLs likely serve as a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/strik?utm_term=sacramento+to+las+vegas+via+395
    • https://wokenapojazud.weebly.com/uploads/1/3/4/7/134753840/9f267df945c686.pdf
    • https://merebidoso.weebly.com/uploads/1/3/4/3/134344951/ba7055d76.pdf
    • https://mugozesomufigor.weebly.com/uploads/1/3/4/6/134608113/bupujoku.pdf
    • https://rinefoza.weebly.com/uploads/1/3/4/8/134883618/14f3386.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0e2ed17e7202640ea1bf0/t/5fc350fa61e25426e1a230c2/1606635771139/apush_ch_1_vocab.pdf
    • https://s3.amazonaws.com/lezerawe/sipaj.pdf
    • https://static1.squarespace.com/static/5fc0e701bda9c57a97be38be/t/5fc17e7ffa04221c71585423/1606516354108/antique_drawer_pulls_ebay.pdf
    • https://s3.amazonaws.com/wozoxub/matuwadi.pdf
    • https://uploads.strikinglycdn.com/files/80be4fd2-c49f-429d-aff0-5d8f669c3f1b/diwigozepilunidebaza.pdf
    • https://s3.amazonaws.com/baxekojojexusol/greater_brisbane_map.pdf
    • https://s3.amazonaws.com/midaguvimabof/video_editor_website_no_download.pdf
    • https://s3.amazonaws.com/lezerawe/fabapales.pdf
    • https://s3.amazonaws.com/roxawo/dafotom.pdf
    • https://uploads.strikinglycdn.com/files/b6500988-9b46-4e88-b4fa-b678ebcbd7b6/nunafavemujebep.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c723.bin
a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC723 6440 bytes
font_01_sfnt_off0000d717.bin
1c9886a59faccbfbcaea0da3feae9f442b1ffce43ea418a619691f383a9b3408		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD717 5724 bytes
font_02_sfnt_off0000ea84.bin
2ac67ef40043ade7e1007514e57c812492da1b133842a59e1165d0748d6dd0f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 10820 bytes

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