Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdc62a4aaa75068…

MALICIOUS

PDF

111.4 KB Created: 2021-03-22 11:33:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d2156ebc32cddffb16d8b4e43ebdfc16 SHA-1: 140b9b05253c0bd9e1e6e1ff553f04b7885068ac SHA-256: 7fdc62a4aaa75068ea5c12226a9c642dd7aeab190d12de081ffb897f63014f5d
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The document body is heavily obfuscated and unreadable, but the presence of external URLs and the 'PDF_SEO_LINK_FARM' heuristic indicate an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

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 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.
  • 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://bologen.ru/award?keyword=cellsentials+usana+pdf+espa%25C3%25B1ol PDF link annotation
    • http://vofefipegurixu.iblogger.org/11089709006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501214/normal_6000bf09505a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_5fd253b1d0c8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419205/normal_5fd11d602bb19.pdfIn PDF document text
    • http://lifokuvaxodime.iblogger.org/adobe_acrobat_xi_pro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465400/normal_5ff9fa57c3467.pdfIn PDF document text
    • http://gexedufez.22web.org/cisco_introduction_to_networks_chapter_6_exam_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410013/normal_604ee29a677c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://e19809cf-df80-48c1-9975-8599b001ad7a.filesusr.com/ugd/062cdf_c8102ce7830e4efcb1a93b65c5beea6d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rotowan/chatbot_ui_template_for_website_free.pdfIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_816168af233d448a9a032c6896c9801c.pdf?index=trueIn PDF document text
    • https://8650d040-a33d-467d-a608-6706f181f11b.filesusr.com/ugd/61b8bf_49ce82c71ad74afa932d235d927b4239.pdf?index=trueIn PDF document text
    • http://selusibe.epizy.com/dementia_guidelines.pdfIn PDF document text
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_33d15b7c3b14481d8742cfbefb127abe.pdf?index=trueIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_b25ac2f0c27a4943ad8c1f0f25296a35.pdf?index=trueIn PDF document text
    • http://vimomata.rf.gd/bangalore_university_b._com_syllabus_2020.pdfIn PDF document text
    • http://nedilopasosugop.epizy.com/android_8_navigation_bar_settings.pdfIn PDF document text
    • http://vugokaduliro.rf.gd/arthritis_research_knee_exercises.pdfIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_f4da11f2c0594876942a555ed2719e67.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/petsafe_anti_bark_spray_collar_troubleshooting.pdfIn PDF document text
    • http://gonuwufif.epizy.com/26627714496.pdfIn PDF document text
    • http://zivosefim.rf.gd/what_is_military_operations_other_than_war.pdfIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_d002f508851449c48f15e7e65108507d.pdf?index=trueIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_cf9cf6b05b2b47108c11c407dc3ecff3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/1984_macintosh_commercial_analysis_worksheet_answer_key.pdfIn PDF document text
    • http://xipisageju.epizy.com/astm_b117_95.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000162c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162C5 5056 bytes
SHA-256: 1664ef07080daacd297ebfa3e3a0df223061f890c0c799fe14de0a6d6098882c
font_01_sfnt_off000173c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173C0 6148 bytes
SHA-256: 149738eb3e1d0bfb4a5732e89a115965e6f0cf3fc4971c694d3ce3619176544d
font_02_sfnt_off0001839f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1839F 12616 bytes
SHA-256: 54c5ae5db4e0c4b55fa47b88e0d040decec087faaa35b79595d4feaf65e98c01

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