Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45de9599cbcebb5…

MALICIOUS

PDF

132.1 KB Created: 2021-03-28 16:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 15b617d0149c28e1d6d736999b2a0542 SHA-1: 45360b6be2e3a75e2555e9742369956bbc1afa77 SHA-256: f45de9599cbcebb554ee4f3efdf3d86ea77a13ad5b993e58705a07b25a8fb5e4
172 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicative of a link farm or phishing campaign. The presence of urgency lures and download button text further supports a malicious intent to trick the user. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a lure for a phishing attack or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/123?utm_term=rrb+allahabad+ntpc+form+modify PDF link annotation
    • http://delozofize.scienceontheweb.net/abdul_kalam_agni_siragugal_book_in_tamil_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gewewoturila/Sgd7hcm/milewofazem.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/gDjhlha/32678605336.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/dbt_skills_worksheets_free.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/cphjhiy/noah_knows_toca_life_pets_secrets.pdfIn PDF document text
    • http://kigumelez.medianewsonline.com/oxford_bookworms_collection_crime_never_pays.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/81720522731.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiren/PfgfMnH/pixies_band_poster.pdfIn PDF document text
    • https://cdn.sqhk.co/wotinobeb/gdHSijk/the_movie_looper_explained.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vapite/yahoo_finance_portfolio_performance_chart.pdfIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/math_facts_computer_games.pdfIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_354e918e4ba5470fbebcfac274c6276b.pdf?index=trueIn PDF document text
    • http://kadoxosin.atwebpages.com/how_to_release_psoas_with_ball.pdfIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_03447922f3544e88ad2df67ec7b77d30.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/uc_browser_apk_free_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/vakanepi.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/free_subcontractor_agreement_template_word_australia.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_a10991c015254e22981504f179980869.pdf?index=trueIn PDF document text
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_54886fc786ba4cc48f7bd0c5dedcdc22.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/bsn_ortho_glass_splinting_manual.pdfIn PDF document text
    • http://zakefuki.myartsonline.com/49363205787.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/xofel.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/zasuxulixironob.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/pdf_biochemistry_for_medical_students.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6A8 5136 bytes
SHA-256: 3741b108d1ebec2b8d6aeeafc50e18e0e0be6f04ebbc0936631b506f5e7ff8cd
font_01_sfnt_off0001b7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7E1 10728 bytes
SHA-256: ddd0257248d3a4bbf53abf0567704035397bb38783b3c57204caff23f1592cfb
font_02_sfnt_off0001dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC88 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf
font_03_sfnt_off0001f1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1B6 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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