Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f4e3dc743beb53…

MALICIOUS

PDF

97.0 KB Created: 2021-03-18 09:16:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6918270a1f81463551da71ebf276aaea SHA-1: 51be1fbe227b8d661414dec1ffe6b88318ee06b4 SHA-256: 39f4e3dc743beb531bba5d968d2edd49afd500acda7e14626ec2061acd549813
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/123?utm_term=happy+birthday+gif++for+brother PDF link annotation
    • http://buviturowugigew.66ghz.com/21_irrefutable_laws_of_leadership_study_guide.pdfIn PDF document text
    • http://koteyarn.moscow/nilusawodejuzawutatonudaw3x73.pdfIn PDF document text
    • http://glawerry.online/rekanuzazemefopiruvuuyrf0.pdfIn PDF document text
    • http://faromobipon.22web.org/days_of_the_week_worksheets_ks1.pdfIn PDF document text
    • http://mebelintera.ru/1kz435.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/86866048997k62ij.pdfIn PDF document text
    • http://baltika-trans.com/kakalavuovujl.pdfIn PDF document text
    • http://discovljzg.fun/romantic_mbti_compatibility_chart7bzxl.pdfIn PDF document text
    • http://koprovk.xyz/wiwifijigoze96q3x.pdfIn PDF document text
    • http://tajoraf.22web.org/sites_to_pirated_books.pdfIn PDF document text
    • http://kataeta.club/421120918254voht.pdfIn PDF document text
    • http://zazixewobid.22web.org/8941066734.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jipelaliw.epizy.com/72673946459.pdfIn PDF document text
    • http://lozosotozaroxi.rf.gd/gazitav.pdfIn PDF document text
    • http://xotaferuju.myartsonline.com/2008_jeep_jk_rubicon_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f5bb1cb-fca1-4e85-92f8-f166fd435045/vishnu_sahasranama_in_kannada_written_language.pdfIn PDF document text
    • http://palelezugob.onlinewebshop.net/john_creswell_research_design_5th_edition.pdfIn PDF document text
    • http://zovaner.rf.gd/boxenapine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d24b87e-cea1-4f5e-af36-2399231cb466/beats_by_dr_dre_solo_hd_cable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f36a941e-7f60-48c7-a91b-4030d836a32f/citizen_eco_drive_watch_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/994339c7-06b6-468c-9bf2-d346fa194ad3/who_are_the_five_primordial_deities.pdfIn PDF document text
    • http://fijoxim.epizy.com/kororupojodifixadopubu.pdfIn PDF document text
    • http://nesazovopiw.rf.gd/trepdee_beng_beng_ft_peruzzi.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_off0001228f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228F 5296 bytes
SHA-256: 7fb83bde4bf91d3e3197bb537402968051531d3b9d32834bb54826c4ab92c78d
font_01_sfnt_off0001348f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348F 13816 bytes
SHA-256: fc1f6ff0c8e6d20915d93d195bcaf84c0027fd03df6162eed833fc3da3173294
font_02_sfnt_off00016133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16133 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61

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