Malicious PDF — malware analysis report

Static analysis result for SHA-256 3656d2f08459832b…

MALICIOUS

PDF

98.6 KB Created: 2021-05-14 18:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 32992e3b371ef61b42ae23a5000ae723 SHA-1: 90a9728a971deaeae44d1673edb2946414e8d1d4 SHA-256: 3656d2f08459832b47c95812811a8c06169dbae02fe4bb222767919f225e022f
156 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 0.9988

Heuristics 5

  • 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.
  • 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://resalured.ru/strik?utm_term=how+to+screenshot+on+iphone+6+plus+without+home+button PDF link annotation
    • http://melivoxigozige.mypressonline.com/caruman_perkeso_2020.pdfIn PDF document text
    • http://jakusavu.sportsontheweb.net/the_source_for_aphasia_therapy.pdfIn PDF document text
    • http://kefudepoduwudi.sportsontheweb.net/49131524452.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/xiehdha/24323315801.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/bigi2Fh/warrior_mindset_police_training.pdfIn PDF document text
    • https://cdn.sqhk.co/morureju/e0jcXia/78558751654.pdfIn PDF document text
    • https://cdn.sqhk.co/wobimore/gjcncja/xapewubotokudosona.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bojafazes/how_to_connect_sony_mdr-zx330bt_to_iphone.pdfIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_0ce66e552b1b4d4da3b916935e052eba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/sapporo_ichiban_noodles_nutrition_information.pdfIn PDF document text
    • http://zivexotafoni.myartsonline.com/scientific_names_of_plants.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/2500_in_1960_value_today.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/35857576077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d02b729c-d01c-4197-908b-c79a0aa17720/kuxisipofodumiwelepe.pdfIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/7497236642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8731c0c3-09c3-4997-ad68-b122d15d3a8a/what_are_the_similarities_between_bacteria_viruses_and_eukaryotic_cells.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/dbt_workbook_free_download.pdfIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_ae86ac6da9274160af507c373e901131.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_14bd5743db59491996b945bab8a58e05.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/falevi/xawifabetelalo.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_d03436353e834e4596f83ef631bee6aa.pdf?index=trueIn PDF document text
    • https://e8802323-0824-40c5-8a58-19d700e27586.filesusr.com/ugd/50cafd_714f46d70a9548658686a4abe42b2164.pdf?index=trueIn PDF document text
    • http://sadoboxijowem.myartsonline.com/ecology_and_environment_notes_for_ias.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/dlink_powerline_av_500_setup.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00015fc4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15FC4 17720 bytes
SHA-256: c0ccb9cbefbfbf32055cd1823707f631382990ae3f0aeb89df3fc893b7b7229d
font_00_sfnt_off000124d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D3 5312 bytes
SHA-256: 61d5968c5e4782f54cd115d1c56e9a875462fe3439a691d003e857fd6fc23460
font_01_sfnt_off000136cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CB 12000 bytes
SHA-256: 31016f1515a980ca523bc8160a936e722dcde9bb73f36b52182d8affe7b5e758