Malicious PDF — malware analysis report

Static analysis result for SHA-256 d909a4d1248663b7…

MALICIOUS

PDF

76.7 KB Created: 2021-06-07 15:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f910aafa8382f455f7b7415c8424f14a SHA-1: ecf87c5b374f8b2bbc98e97c2a9f42ae82ef919e SHA-256: d909a4d1248663b717ea4e879151f398df2a634a044627079b6f1836879f247a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in phishing or to distribute further malware. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of links, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pixomot.ru/pbw?utm_term=brainpop+world+war+1+worksheet+answers
    • https://static.s123-cdn-static-d.com/uploads/4393020/normal_60b77c8f655e5.pdf
    • https://lenudigibelap.weebly.com/uploads/1/3/7/4/137499492/33efe3462410c.pdf
    • https://xijaxerunoseme.weebly.com/uploads/1/3/4/3/134306079/7494814.pdf
    • https://cdn-cms.f-static.net/uploads/4501193/normal_6026b21374be7.pdf
    • https://cdn-cms.f-static.net/uploads/4424646/normal_60b83e654b849.pdf
    • https://mexakogu.weebly.com/uploads/1/3/5/9/135981712/8367167.pdf
    • https://cdn-cms.f-static.net/uploads/4475572/normal_601b2dfd126d2.pdf
    • https://cdn-cms.f-static.net/uploads/4473903/normal_6050358e511b1.pdf
    • https://xidawelopumez.weebly.com/uploads/1/3/4/4/134439163/xuxakata.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f4cf83a4-5200-4866-b5a3-643938a33ef1/free_fire_diamond_maker_app.pdf
    • https://uploads.strikinglycdn.com/files/ca717a6f-2ef2-4e0c-92b4-4ac2e55a1d35/25102390007.pdf
    • https://uploads.strikinglycdn.com/files/dc8036f5-700d-41c8-97cd-3bf33bc8a100/73956956844.pdf
    • http://xorunezagu.pbworks.com/f/ejercicios_de_diferencia_de_cuadrados_perfectos_resueltos.pdf
    • https://uploads.strikinglycdn.com/files/2ab835b0-95dc-4ac0-8fdb-c38e2d53f132/bitimovelep.pdf
    • https://uploads.strikinglycdn.com/files/b9e7b791-495c-46ef-b823-ee897d877b89/how_do_i_retrieve_deleted_texts_android.pdf
    • https://uploads.strikinglycdn.com/files/ad77b40f-4cf5-4b57-a8d0-152cc177f8b7/matlab_simulink_tutorial_for_beginners_full.pdf
    • http://kiletejude.pbworks.com/f/download_spotify_premium_apk_terbaru_2021.pdf
    • https://uploads.strikinglycdn.com/files/04f538ce-10c4-4dcc-8a3d-2c008b35b7c5/66357996952.pdf
    • http://murenet.pbworks.com/f/48460629149.pdf
    • https://uploads.strikinglycdn.com/files/3d958439-2250-4f7a-a65c-8ffd20196d23/tawevofix.pdf
    • https://uploads.strikinglycdn.com/files/943af425-6f27-48f6-a3c2-5adbb132093c/how_should_user_stories_be_written_in_safe.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_off0000eef3.bin
c1a248ed66ca679af6321bb2acad2b8371eb757c5af3f362355d7aa38838f1ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 5304 bytes
font_01_sfnt_off0001010b.bin
ad62d20ef6eea101e20e7054d976289d80082129ad9f96160d71078dea52add3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1010B 10716 bytes