Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d31f16da9dc582…

MALICIOUS

PDF

70.4 KB Created: 2021-03-27 17:22:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f1cf6d3fa079850d1614711a1f143a7a SHA-1: 4d909f934a0215a3b6d961b44a92a3990b467bc5 SHA-256: 31d31f16da9dc582babf76a9244eccb20da78b27194e399ce7e1ef0a218ad6fc
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 0.9998

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://gimoguvi.ru/award?keyword=medical+terminology+quiz+with+answers+pdf PDF link annotation
    • http://rawoxaxevog.mygamesonline.org/anterior_cruciate_ligament_tear.pdfIn PDF document text
    • https://tadarumoroje.weebly.com/uploads/1/3/4/7/134724086/1184453.pdfIn PDF document text
    • https://jobuvofuwado.weebly.com/uploads/1/3/1/4/131483112/gabudaf.pdfIn PDF document text
    • https://zigajimimokok.weebly.com/uploads/1/3/1/3/131383588/zidux-nisimu-lakevufo.pdfIn PDF document text
    • http://sedisifoxe.22web.org/judepoza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427077/normal_6024cb7feeacf.pdfIn PDF document text
    • http://sreda.city/vivotikodezorupovwv9x.pdfIn PDF document text
    • https://sizuginoten.weebly.com/uploads/1/3/4/4/134490660/4264081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443819/normal_6025672982839.pdfIn PDF document text
    • http://bagomebefekixob.getenjoyment.net/81570305563.pdfIn PDF document text
    • http://f1l3download.site/how_to_do_high_intensity_resistance_trainingzxick.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/YjiJaic/vanevafot.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/ibjgLPq/50234433637.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490132/normal_5ff24b9563190.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gulopajekojof.epizy.com/colonoscopy_cancer_screening_guidelines.pdfIn PDF document text
    • http://wogavevowef.rf.gd/fidezinevepojadekadufu.pdfIn PDF document text
    • http://sajobovu.epizy.com/bootstrap_4_tutorial_w3schools.pdfIn PDF document text
    • http://rodexiguv.onlinewebshop.net/92669749234.pdfIn PDF document text
    • http://bidavavaxekize.epizy.com/59021067413.pdfIn PDF document text
    • http://dajomilot.atwebpages.com/5739988279.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43A 5944 bytes
SHA-256: 4bfa223b8be74dda93744f63180d6ebee95ad2aa4b6683c6d94655dd70c7335b
font_01_sfnt_off0000e86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86E 10528 bytes
SHA-256: 1d818dd0456b9ee1c969f22b0aa8061858b1ca2a2fe977c9f6f06935d67f16e6

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