Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79bc8f669f3eff2…

MALICIOUS

PDF

76.1 KB Created: 2021-03-07 16:36:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2ca65ba68554f8ec05bebc3f4770f750 SHA-1: 6e545da7491b093f34ad482877a51b2e0439ae3f SHA-256: b79bc8f669f3eff2f47e23740defe36df0f6b6ec147f0b8ae389acfd0411ce73
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, but the presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://golowaki.ru/wix?keyword=number+after+trillion PDF link annotation
    • http://ledozikatiresev.scienceontheweb.net/ronaxas.pdfIn PDF document text
    • http://bodipok.getenjoyment.net/63639244507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_60412a064269f.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/mowabesixerokefag.pdfIn PDF document text
    • http://zubosoxi.22web.org/digitech_rp50_manuale_italiano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372740/normal_5fd0471cd76e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417662/normal_5fcbfe2ec69f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_18590953a18e493c99159f75774d7fad.pdf?index=trueIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_8bf7cb17dd5f414382c9f34aff4b49f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b88af6f-b966-4ff7-adf4-7121fbdce236/how_do_i_contact_buffalo_wild_wings_corporate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/420a625c-c3a1-4ec4-9a4a-1f759e1d4700/nibunazovokisawinesika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07bb8301-2818-48e7-97ca-d75143229185/dokuxot.pdfIn PDF document text
    • http://mujijebal.epizy.com/e-_bike_market_report.pdfIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_2b85985e45c04c3f8f06846f4ac502d8.pdf?index=trueIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_4fd23dd12ed0463c94cc689b6f37eeed.pdf?index=trueIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_73e7e723133e41f5b943b659de959798.pdf?index=trueIn PDF document text
    • http://fomebitatabapid.epizy.com/visita_iglesia_prayer_guide_tagalog_printable.pdfIn PDF document text
    • http://rirafegibub.rf.gd/transition_words_to_use_in_your_first_body_paragraph.pdfIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_6e792019e7904083a98b7926df7f01c1.pdf?index=trueIn PDF document text
    • http://ligeziwofumupo.epizy.com/dataxofi.pdfIn PDF document text
    • http://tiwosutodegadax.onlinewebshop.net/nutubawuvazopor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/356cd8a4-25cb-4071-aadc-00375fa9d01a/rizulukedore.pdfIn PDF document text
    • http://lazuletezofik.onlinewebshop.net/bubozabawiwuzol.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_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 4844 bytes
SHA-256: f60f71e9c6d1b3a1f681f347a01c3cbcb8482d291a4622c3d3ea9dbc3b8fa62c
font_01_sfnt_off0000feed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 10672 bytes
SHA-256: 667c608d933598fb91b432ab240fbccfcafdad35eec1a07943fa2fde956f73e8