Malicious PDF — malware analysis report

Static analysis result for SHA-256 35048a55d16654b6…

MALICIOUS

PDF

107.3 KB Created: 2021-04-29 09:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0a31ca10f08ee31bff646691382ffff6 SHA-1: a8fd494adf1ac838c89892d5fa6fbc1c26236ef6 SHA-256: 35048a55d16654b6c881d524cc2ca26328b8f8cae15d4565d032276be7d5ef47
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://druttle.ru/strik?utm_term=bersa+380+model+85+review PDF link annotation
    • https://cdn.sqhk.co/penomufepuk/hhjojjP/balloon_decoration_for_baby_shower_singapore.pdfIn PDF document text
    • http://apsdd54gfv.xyz/grim_dawn_keeps_crashingmjvtp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482023/normal_5feb090472de6.pdfIn PDF document text
    • https://cdn.sqhk.co/nokikifabaf/S0AgixJ/shortcut_run_command_in_ubuntu.pdfIn PDF document text
    • http://blockhcain.host/41371757736fbzki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488555/normal_5fd3876f99522.pdfIn PDF document text
    • http://dutov.org/numbers_in_english_1-_1000enb8s.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/qCFbfIF/free_funeral_program_brochure_psd_template.pdfIn PDF document text
    • http://phtech.site/98597860511u5slz.pdfIn PDF document text
    • http://popularchoice.space/227291029158jv5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_6031faa205de1.pdfIn PDF document text
    • https://cdn.sqhk.co/kanedufopuma/fHhfche/zugepifuzaxosi.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/zowejunef/65285953016.pdfIn PDF document text
    • https://926fca10-1439-4adc-b819-38dad5327275.filesusr.com/ugd/26d6d3_3fa9f101cc764558a898ee42c3f30d26.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/birdbrain_crossword_puzzle_answer.pdfIn PDF document text
    • http://bawexoji.rf.gd/31628304832.pdfIn PDF document text
    • http://kagexukus.rf.gd/lobaxawixemujuzivexukus.pdfIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_01ee4c62a36c41adb2e5b9f416adaafa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fifomi/income_guidelines_for_medicaid_in_arkansas.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_1f3ba3531b7a4123a1639d095aa91029.pdf?index=trueIn PDF document text
    • http://buxuzob.epizy.com/25170768706.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_5c1cd96c78b3422a9dd0604581918db5.pdf?index=trueIn PDF document text
    • http://bidemuv.rf.gd/inductive_and_deductive_approach_in_research_methodology.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://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_off00014cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF6 5796 bytes
SHA-256: c91f0386723dffce89cfa7f82c39d32e374b87e876d307678d278d1932a9ee4a
font_01_sfnt_off000160a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160A5 12812 bytes
SHA-256: 83b1dfd902371cb33895de9cb54d10f831f26941c3ecbd426fe4f7407c4dce86
font_02_sfnt_off00018a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A8C 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727