Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e917ff0331f1c3…

MALICIOUS

PDF

94.3 KB Created: 2021-03-24 10:14:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 795b68638587422d4463f70c3cc07256 SHA-1: 568134840b7428b3f7af2ca332f3edbb9764a432 SHA-256: a3e917ff0331f1c346a9aaaf467427210b9018f9d8dc431b20976a487bbf8b6e
134 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. It uses an invoice-themed lure. 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 0.9989

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://baarspo.ru/wix?keyword=in+mixed+company+9th+edition+pdf+download PDF link annotation
    • http://teraxekubute.iblogger.org/38060415236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451039/normal_5fdb3b0dc3238.pdfIn PDF document text
    • http://sukuzarimeke.22web.org/35873852579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_602527c5d5906.pdfIn PDF document text
    • http://kneeksi.ru/xiguvunaxazockc6n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455660/normal_6022060dab134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480174/normal_5fdb92febe040.pdfIn PDF document text
    • http://sendgrid-de.com/62491172951plx7f.pdfIn PDF document text
    • http://fejituwetogin.iblogger.org/49010451502.pdfIn PDF document text
    • http://raisinsapp.pro/dimuzazigopomonokadohkop8.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/kesek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5fd6632d95a35.pdfIn PDF document text
    • http://reform-st.ru/horton_hears_a_who_full_movie_123movieskqfhu.pdfIn PDF document text
    • http://kimiter.medianewsonline.com/mercruiser_4.3_engine_oil_capacity.pdfIn PDF document text
    • http://ig-about.net/kolizokoxepilenipejasare42mv2.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/adverbs_of_manner_place_time_and_frequency_worksheets.pdfIn PDF document text
    • http://wativeb.mypressonline.com/cadena_perpetua_en_colombia.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/rodiligarexo/82638442685.pdfIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_c084c2f108c94d23b30c407b7441eda1.pdf?index=trueIn PDF document text
    • http://gezozanalenebun.rf.gd/89681347801.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/mythbusters_duct_tape_island_worksheet_answers.pdfIn PDF document text
    • http://sovogezo.atwebpages.com/aneurisma_aortico_disecante.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_05ce7f5688a4470194d7c8b83ef9d251.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/96763119509.pdfIn PDF document text
    • https://60883313-e483-4213-bdf2-3844198a3b35.filesusr.com/ugd/3ba96b_d2cbc4de16af48ea8e35d1af30857d0f.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B3 5476 bytes
SHA-256: 5c85792297134944dc3029b9c05fc9115f31dbab16702859733d7a550673574d
font_01_sfnt_off00012b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B58 12056 bytes
SHA-256: 99280ff3484a1aa4447bd984a637b056c7b5bcef4b89bd0c37e4c89ee8e38b26
font_02_sfnt_off000153da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153DA 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501