Malicious PDF — malware analysis report

Static analysis result for SHA-256 54eced448cb12b23…

MALICIOUS

PDF

72.1 KB Created: 2021-03-24 08:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 34cb53a73ac4f593ae116de8ffb53e5a SHA-1: 1701ea9ae0d8611d82e5866bae46d6810aa6df47 SHA-256: 54eced448cb12b23f316fdad6c6e9f04c6b7f776667587bb916cbafd1b458c19
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/wix?keyword=words+starting+and+ending+with+t PDF link annotation
    • https://cdn.sqhk.co/nakotuba/g9Hjii3/80022053398.pdfIn PDF document text
    • https://cdn.sqhk.co/womibakok/tjfygdS/21400700337.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/conversation_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/JgipuWJ/ice_cream_truck_for_sale_craigslist_michigan.pdfIn PDF document text
    • https://cdn.sqhk.co/moxelutedoje/hgidfoY/16978960929.pdfIn PDF document text
    • https://cdn.sqhk.co/noremixujor/uAgdmhf/the_factory_kitchen_las_vegas.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/SEr5ify/xowomarefazugojogu.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/6PyhheQ/gunevege.pdfIn PDF document text
    • https://cdn.sqhk.co/popaxutu/hcSvCjf/insanity_flyff_item_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xosuridasago/bjcjgUV/kuxevekofavimuguvewib.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/aRoGjeS/newodudabiwigoduki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa9f1ef3-5077-4242-8274-b3d77ea3907f/nordictrack_1750_treadmill_specs.pdfIn PDF document text
    • http://renubinivudeti.epizy.com/26188937314.pdfIn PDF document text
    • http://batapijas.myartsonline.com/auxotrophic_mutants.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/carotid_doppler_ultrasound.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9acfcd6-81f0-40e9-8b7d-d9159c63fdd1/how_to_have_multiple_streams_of_income_in_college.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_f7a5a72d27554ddb9a1baee3a4623767.pdf?index=trueIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_e58f4a4ea687422f9c401e6c27a644e8.pdf?index=trueIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_c96c0e81a98a4827a09d7a31585715a4.pdf?index=trueIn PDF document text
    • http://vulikoviluxugu.rf.gd/airshou_iphone_4s.pdfIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_91e3d2f7d6e948ffa4f21202eb305d38.pdf?index=trueIn PDF document text
    • http://zexizel.epizy.com/how_to_day_trade_options.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_99eca886de7140279221896d742efe74.pdf?index=trueIn PDF document text
    • http://lavodusepigixu.rf.gd/bbc_civilisations_episode_guide.pdfIn 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_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 5160 bytes
SHA-256: 264cc37e13cc8e2694f3077cf00473bb37f4dfe69ff888eafa229a030e4b4fa0
font_01_sfnt_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 11304 bytes
SHA-256: a6384f8cefdf60ad629b060f40ea5535d93f8a4340207dfe579d77e7144f6c19