Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87d788c85c387af…

MALICIOUS

PDF

79.3 KB Created: 2021-03-23 06:53:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 919f42d5fcbc158a00119d9ee2911afb SHA-1: be1bc29cf7087ab7bc79b0861f23eb600b9daf19 SHA-256: f87d788c85c387afef3b66c01d9c51bb09ea3781d00fa2be69d6768c763940f1
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to translation, directing users to external sites that likely host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/award?keyword=como+traducir+pdf+de+aleman+a+espa%25C3%25B1ol PDF link annotation
    • https://vamolitewule.weebly.com/uploads/1/3/4/6/134670516/145278.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460070/normal_5fe362d925024.pdfIn PDF document text
    • http://zeropium.com/kobukisevulorudimipetgxhae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383327/normal_6011e3f9952c2.pdfIn PDF document text
    • http://euroshopme.site/joseph_joseph_rice_cooker_manualu64zv.pdfIn PDF document text
    • http://nesobaka3.xyz/miwowux5ozwb.pdfIn PDF document text
    • http://mon-cmbretagne.com/introductory_chemistry_a_foundation_8e_answers64wct.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372376/normal_5ff7aea3a437a.pdfIn PDF document text
    • http://sbrf.link/firugikamiva0bq6n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410714/normal_603b3a0b3c3aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465255/normal_603f1c60b512a.pdfIn PDF document text
    • https://kegipulavuraruz.weebly.com/uploads/1/3/1/1/131163865/dukenolisejape_patoki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403805/normal_5fcb6bd4af676.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386848/normal_5fcdc1a973474.pdfIn PDF document text
    • https://lunafegosewexik.weebly.com/uploads/1/3/5/3/135351611/fafozomaxad.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/db2c3433-c79a-481a-9e87-0ed57f75bbc7/mandolin_exercises_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4adef741-7ddd-43e2-bb5b-f3767c6324b8/28212681593.pdfIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_a862bb3360bd4ec9804cc551c5af32c2.pdf?index=trueIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_c78509ae11464612a26f6dcb340f7740.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dee27d0-cfa7-4560-b63e-52dcf946975f/what_is_thermodynamics_in_simple_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f455f384-1a36-4d40-8ff3-e220836d5baa/mubitexazekuvelepex.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_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 5416 bytes
SHA-256: a5aafb0f582ac27bf90807636cc5146a50307a45dd00ccdfcacb9a9640fa9c30
font_01_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 11868 bytes
SHA-256: 7cc4824214966a42b594526175476f371465710ff3d6550ad98b2a55fea7537e

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