Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e0de76d18eaae1…

MALICIOUS

PDF

76.5 KB Created: 2021-03-29 21:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c91564e6f274a0e261308fa6a0075f52 SHA-1: d239a4b8dfdd6decfcf1ce3c48044ce127ec18ca SHA-256: d9e0de76d18eaae14cdd0078c44736a5b3fe11bd2ad896d6a746bff8d93b3843
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection as Pdf.Phishing.Trojan further supports its malicious classification. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/award?keyword=los+agentes+econ%25C3%25B3micos+pdf
    • https://niraxonaweza.weebly.com/uploads/1/3/4/0/134000156/bumaviretadazazitus.pdf
    • http://becloud.website/nalaxozajabipudij0zgr.pdf
    • https://bosaralox.weebly.com/uploads/1/3/4/6/134608385/9b5c4644b6cd5.pdf
    • http://new-volosi.ru/vocabulary_workshop_level_c_answers_unit_139bwd6.pdf
    • https://fefedajukuda.weebly.com/uploads/1/3/1/0/131070841/3084644.pdf
    • http://vogolimipogusoz.mypressonline.com/pertempuran_bandung_lautan_api.pdf
    • https://narosixepitifon.weebly.com/uploads/1/3/5/9/135960882/xebexudageto.pdf
    • https://tedipoji.weebly.com/uploads/1/3/1/4/131408178/4928751.pdf
    • http://jivusibofonefud.mygamesonline.org/broken_vessels_hillsong_lyrics.pdf
    • https://mafexanilexa.weebly.com/uploads/1/3/0/7/130739060/35e364078e88f33.pdf
    • https://leponinidokawe.weebly.com/uploads/1/3/4/5/134502666/5206435.pdf
    • http://romakipojaxu.mygamesonline.org/jimot.pdf
    • http://donbetosstreettacos.com/el_caballero_de_la_armadura_oxidada_resumen_reseagrobh.pdf
    • https://mawakizuk.weebly.com/uploads/1/3/0/7/130775730/d09891e7fc4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zarelusipofox/18895114321.pdf
    • https://s3.amazonaws.com/voxulija/cv_template_english.pdf
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_3d9248eb6ed0471aa6e7d0001ebb1825.pdf?index=true
    • http://dakafatuvuguviz.atwebpages.com/how_to_train_your_dragon_2_villains_wiki.pdf
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_9e6bc9d7a92c4f4ea5cf5df6857cca89.pdf?index=true
    • https://s3.amazonaws.com/mefonevimimix/canales_de_tv_puerto_rico_apk.pdf
    • https://s3.amazonaws.com/bomifabipi/newasaselivapavojak.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de36.bin
d1c268a1d48ed2ba3cc6c0c1da1a39476a9b8b2acd76fcffacdebe409b0bdb7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE36 5212 bytes
font_01_sfnt_off0000efa7.bin
d364e146af77fe13e055b3e6cf59826ca50e324be6c77697f3f6fa837196321f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 11416 bytes
font_02_sfnt_off00011472.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11472 4324 bytes

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