Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a017b6dcd0ed96…

MALICIOUS

PDF

70.1 KB Created: 2021-03-16 09:54:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f83522ff48a1becfe3c7c7822e845e5f SHA-1: 8dace600148d49099ef8b62443cb8bdd6379a092 SHA-256: 82a017b6dcd0ed9669f97a04744aa1ec8d0589a73881dc89cf9db88a04d79479
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of an external URI and the overall detection scores strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wix?keyword=drawing+circuits+worksheet+ks2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476930/normal_5fd1b82f61672.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369643/normal_60020c4a8663a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451551/normal_603fa5d8aa360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406482/normal_602b4f0a3578e.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/IgcjjlL/musejexawax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_6040631f92a3f.pdfIn PDF document text
    • https://cdn.sqhk.co/jomawutid/je6EicD/80580341633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481695/normal_6027be6b72ce3.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/idFifDE/fijufudumukabozarupopok.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/cidS7st/campground_with_water_park_in_florida.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/MGajgjg/tails_os_requirements.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419235/normal_603290b87fb89.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/ifehchc/acg_number_coloring_page.pdfIn PDF document text
    • https://cdn.sqhk.co/subilikiwi/YPgehgh/29674262631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481155/normal_60204620df14a.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://uploads.strikinglycdn.com/files/bb6ead68-0736-4753-9fa1-e6600d678bbb/nyc_cdl_test_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d7c3ee4-0a61-4b53-83c9-9a883409fff9/17816330769.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/what_does_delayed_milestones_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/learn_russian_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2de7b5a1-a419-4059-a45e-d61bcfb9c27f/how_to_write_morning_pages.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/26793782107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0236331f-a119-4ec9-8874-175cf02eb26c/jeluwuruwofudibube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6e5be0e-90fb-4467-8d4b-de544eb6ef21/guvedomewamumifapu.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_off0000c829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC829 5200 bytes
SHA-256: fe0e82bbc2aa7130688d9fce5d3ee0a2d2fd69744c70ac32d3c1ce76d0ef32a3
font_01_sfnt_off0000d9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 9676 bytes
SHA-256: 57cff418d2f9daf7b7c3161558eadb05971b96168f523ca677aefd8d2f5a4433
font_02_sfnt_off0000fb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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