Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7aa07a9848378ab…

MALICIOUS

PDF

76.1 KB Created: 2021-03-10 01:47:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5537f72ace1c6e659228783413128819 SHA-1: 693ff174e104a92a993614e616d41e00db0776fd SHA-256: a7aa07a9848378aba9e3764f7186a049c3a39a6177b486e769bb71401821ec92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

The PDF file contains a large number of embedded external links, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the sheer volume of suspicious URLs points to a content-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://midufefew.ru/award?keyword=cambiale+tratta+e+pagher%25C3%25B2+pdf
    • http://korirojasutito.22web.org/pefifetu.pdf
    • https://jejofiwapo.weebly.com/uploads/1/3/5/3/135312812/kibowakozi_buvuso.pdf
    • https://rudazijix.weebly.com/uploads/1/3/1/4/131453676/2418230.pdf
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/tabut.pdf
    • https://sibomimotilelib.weebly.com/uploads/1/3/4/2/134235458/vagiled.pdf
    • https://gemitipob.weebly.com/uploads/1/3/4/4/134474898/jenawuzijef.pdf
    • http://shopee24.site/dbt_therapy_online_australiasrw54.pdf
    • http://50offshop.info/roluzijexie1cdw.pdf
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/jijowa-wisunisawel.pdf
    • https://lugonejiborin.weebly.com/uploads/1/3/5/3/135336075/dojisinig.pdf
    • http://dutipajito.22web.org/berichtsheft_vorlage_word_tglich.pdf
    • https://rofajubufilotol.weebly.com/uploads/1/3/1/3/131384128/1356496.pdf
    • https://raguwagoneneza.weebly.com/uploads/1/3/1/3/131384547/gutonedu.pdf
    • http://govnososal.xyz/21295946744fjc65.pdf
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/kumef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_6eb5e73146d74bcb8834864c23f3e968.pdf?index=true
    • http://jajojamoxarug.epizy.com/best_antenna_tuner_for_yaesu_ft-857d.pdf
    • http://disobaratid.rf.gd/53800952780.pdf
    • http://fegosuzix.epizy.com/vehicle_information_app_karnataka.pdf
    • http://wozadubokurego.epizy.com/twitter_video_saver_apk.pdf
    • http://jixetumoxefa.epizy.com/percy_jackson_3_full_movie_in_hindi_dubbed_free_download.pdf
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_e9afdb1c1bb4479fad54e4f1d4f4ef09.pdf?index=true
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_056691b83a234f94be3e8ba54b76859d.pdf?index=true
    • http://fupotuz.rf.gd/87079542243.pdf
    • http://nidalufexif.epizy.com/66903855329.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_off0000ebe2.bin
b44429077beb749c5d0498ec331f2bb411acb2a7108af6a1c026ee951729a624		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 5456 bytes
font_01_sfnt_off0000fdfe.bin
a7bad9cb2f33a73954001f714a2d146686ef7625ec62286dfd3f0ec61dfd6861		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 10900 bytes

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