Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8214a2305c383e0…

MALICIOUS

PDF

77.0 KB Created: 2021-03-23 14:32:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06b30698fcaf3691b7cf8c400800bc45 SHA-1: 91aaf180754394b801146294ee8b44d61567dfa1 SHA-256: a8214a2305c383e0116a797057766beab6841170f87f09ee90702378a1368c0e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, and one specific URL related to a "Wildstar mining guide". The ClamAV detection and ML classifier strongly indicate maliciousness, likely for phishing or SEO spam purposes. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious websites.

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-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://mezovuduw.ru/wix?keyword=wildstar+mining+guide
    • https://lakogobeza.weebly.com/uploads/1/3/4/0/134096968/e8756456fa9.pdf
    • https://cdn-cms.f-static.net/uploads/4426810/normal_60185f471cc8f.pdf
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/kafes_wuzuw.pdf
    • https://fulimutalez.weebly.com/uploads/1/3/4/5/134599943/siraludanibobarewa.pdf
    • https://static.s123-cdn-static.com/uploads/4501975/normal_5ff78155eca2f.pdf
    • https://jozisanolotodix.weebly.com/uploads/1/3/0/9/130969335/lomiwugog-lavuvebe-duvonifiwuroz.pdf
    • http://gemixemufasu.22web.org/zilewuwawimoponikisowi.pdf
    • https://bulobazopikiju.weebly.com/uploads/1/3/0/7/130776241/detamudubapogip.pdf
    • https://static.s123-cdn-static.com/uploads/4403274/normal_5fc5f55200cb4.pdf
    • http://fowirunuwajuk.iblogger.org/bimaxoronazuda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tixedujegibex/appreciation_letter_format_for_employees.pdf
    • http://legofovivaxom.epizy.com/sql_server_2017_reporting_services_install.pdf
    • https://s3.amazonaws.com/nitizobuv/pedax.pdf
    • http://fijazatomowov.epizy.com/ativador_office_2016_baixaki.pdf
    • http://gujupikisikali.epizy.com/33913008678.pdf
    • https://s3.amazonaws.com/kabisebax/extinction_2018_parents_guide.pdf
    • http://rewezaxow.epizy.com/23770959767.pdf
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_4dd4966dddd74ea789e119ef69b83b33.pdf?index=true
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_b43836e9cb0e470e827338cbf3b822ab.pdf?index=true
    • https://s3.amazonaws.com/somamere/ipcc_special_report_1._5_c.pdf
    • https://s3.amazonaws.com/furunumaroxun/captain_marvel_2019_soundtrack.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_off0000efae.bin
b121e64e3f8a5bfc4114b8331c018cc2d633e5dc075408f21c21e93ecda34c24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 5156 bytes
font_01_sfnt_off0001012e.bin
92cd3c857a0d4f778b36a710b7b5d437e0e8be11e44d6c637502e672dbb2843a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1012E 11108 bytes

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