Malicious PDF — malware analysis report

Static analysis result for SHA-256 d142cc1c169ee52c…

MALICIOUS

PDF

96.2 KB Created: 2021-03-23 13:11:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8f2e206835b2bc6e2551ecfeb4de414b SHA-1: f1809345cf1524cd98b663102d9031d82289bf7a SHA-256: d142cc1c169ee52c58877dd18443d0bf8b562fb13aebb00346c33dbe43376e5f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and appears to be a lure for a specific search term, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://midufefew.ru/award?keyword=human+anatomy+4th+edition+mckinley+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384164/normal_6048a2ac0f0c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452608/normal_60471db644736.pdfIn PDF document text
    • https://dafozadojav.weebly.com/uploads/1/3/4/7/134764431/solumidofedelof_vatijupavib_dogobitam_zuxonapazovu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445881/normal_5fc73ac1ad49f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402517/normal_6018531a70c36.pdfIn PDF document text
    • https://ludutuwe.weebly.com/uploads/1/3/4/6/134687162/4569464.pdfIn PDF document text
    • http://jozipuvuwuzaj.mywebcommunity.org/what_is_license_document_number.pdfIn PDF document text
    • http://drenajkrasnodar.ru/alcatel_tcl_lx_a502dl_review0ohly.pdfIn PDF document text
    • http://jugepawe.medianewsonline.com/14670042683.pdfIn PDF document text
    • http://berozava.iblogger.org/codehs_javascript_functions_and_parameters_answers.pdfIn PDF document text
    • https://xulibaro.weebly.com/uploads/1/3/4/0/134041525/pukijuvosejadavaje.pdfIn PDF document text
    • http://moymagazin.xyz/mi424wr-gen3i_port_forwardingivp5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383340/normal_600037f9846e0.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/how_to_write_a_good_summary_4th_grade2a0ym.pdfIn PDF document text
    • http://ledimpress.biz/sherlock_holmes_book_volume_1j7543.pdfIn PDF document text
    • http://top-odejda.com/bikavisj3rae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rodesodekisivu.rf.gd/23593544021.pdfIn PDF document text
    • http://majezomisi.myartsonline.com/mini_international_neuropsychiatric_interview_kid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b36cf26-0bd2-41e5-8d98-04a47c6a44fe/who_is_leta_lestrange_in_fantastic_beasts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c637c4a1-1e38-4267-bd47-435b2f2954e4/39249952973.pdfIn PDF document text
    • http://fovafujunav.epizy.com/52675780556.pdfIn PDF document text
    • http://japamitafixe.myartsonline.com/how_to_make_3d_objects_from_photos.pdfIn PDF document text
    • http://segixiw.epizy.com/bukexezotizunodejuzinen.pdfIn PDF document text
    • http://wofuxuvo.rf.gd/varumu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 19616 bytes
SHA-256: e2521a33f946ffb560838e8e2619e79420fc036e7994724e1dbbd37399b6cf78
font_01_sfnt_off00013305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13305 5336 bytes
SHA-256: ca88e8435015b7a920bdeb0df644fd7859f2142bf7ee7e8efca1077070a2c1ee
font_02_sfnt_off00014519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14519 13488 bytes
SHA-256: a5df5e8d9e9f0bfecf410e5b337c5ec9a856b30d606e19b0f6076960bfdd1b80

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