Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9433469861c0b89…

MALICIOUS

PDF

121.5 KB Created: 2021-03-15 10:53:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6a8b1e4b225a06301896e130d25f4e45 SHA-1: ceb923e4f21a108be5a46b9553022b7d6ba68c98 SHA-256: a9433469861c0b89c415847d874ff395f46d9e4ffb17530dfe26b88dd2fe07f0
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous external links, with one prominent URL leading to a phishing lure about stock options trading. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to malicious or phishing content. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/strik?utm_term=how+to+make+a+call+option+on+robinhood PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413475/normal_60413ffc8bcf3.pdfIn PDF document text
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/ca376e8.pdfIn PDF document text
    • https://zozabamefopofa.weebly.com/uploads/1/3/4/2/134234868/9993076.pdfIn PDF document text
    • https://gajifawegux.weebly.com/uploads/1/3/4/6/134649352/6c62516fde.pdfIn PDF document text
    • https://letateworu.weebly.com/uploads/1/3/4/3/134365764/zunesibus.pdfIn PDF document text
    • https://togawikanow.weebly.com/uploads/1/3/5/3/135320583/bareri-zebozufuxagevub-vabagifunu-wozixadegomifef.pdfIn PDF document text
    • https://warejavusa.weebly.com/uploads/1/3/4/0/134017768/210116.pdfIn PDF document text
    • https://miwejezapelo.weebly.com/uploads/1/3/4/3/134342363/zimamos.pdfIn PDF document text
    • https://karesaxu.weebly.com/uploads/1/3/5/3/135392924/latem_jilukesi_jumedugumir_jonoduvewibaz.pdfIn PDF document text
    • https://lewumirobubav.weebly.com/uploads/1/3/4/7/134762292/8a229c0ab0d3f07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482880/normal_600df20e1eaa7.pdfIn PDF document text
    • https://rolobidixogiru.weebly.com/uploads/1/3/1/6/131637372/1373037.pdfIn PDF document text
    • https://xojozojejaxito.weebly.com/uploads/1/3/4/8/134866115/7332457.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_351ddf52b835453aa90413abe7da3543.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cec721d8-c06a-4ce0-b7fc-70826dc40dba/what_is_the_catch_22_in_the_book_catch_22.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c961f9c5-ca00-419f-869e-be3c9c02bc55/kisadifibotifunifatowazem.pdfIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_299b00ca563640089495f18c81a7a66a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3bf000e-6195-42ed-b156-239a04baf7ac/begagupafoxinajuf.pdfIn PDF document text
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_b6f61143ab124c1c8da4117369366ce4.pdf?index=trueIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_511271a6c77b474da8ac9eaa815d05b8.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E0E 5392 bytes
SHA-256: c7bb22d85d459ba792d93d30b2f8d1383c4162ccec82ae8881d28e7840a5ea67
font_01_sfnt_off0001b03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B03C 11796 bytes
SHA-256: dd9875ae79ec6fc565812a475d997eb0833a09601573de97918a45dccface796