Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f4ae1f2fe0b354…

MALICIOUS

PDF

79.7 KB Created: 2021-03-27 09:51:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d15331bb0eb4d321d43a55e8ab7d8af9 SHA-1: 536c05d1e5067c79c8195a40a4c72819ef227961 SHA-256: 37f4ae1f2fe0b354bc61ac24e77f515e1f4c6e22a6b3b87c1107386cc8d5f5d3
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 0.9996

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://xezojetit.ru/strik?utm_term=ap+human+geography+unit+5+vocab+and+examples PDF link annotation
    • http://dreamingdeveloper.com/92573667982db33z.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/exercices_sur_les_articles_partitifs5yy8b.pdfIn PDF document text
    • http://the-english-temple.com/42987576938io8f3.pdfIn PDF document text
    • http://duplicwcnj.space/atoms_and_molecules_worksheet_grade_7m52he.pdfIn PDF document text
    • http://lnstagramcentre.net/45424356326149mr.pdfIn PDF document text
    • http://hempmap.ru/75329442662k9dq4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d678e36d-9155-4880-89dc-f6cbc260bd0d/dawutigufi.pdfIn PDF document text
    • https://334e481f-4595-4613-8514-cf1b68b0f675.filesusr.com/ugd/a5bb32_40f5ed1953e64291a8b1a27dbe72a774.pdf?index=trueIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_6845a8239f474c26bb95ae0dd8046036.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/benuka/gedazijasajorave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c635cbe-0408-418a-9866-b5a8e0102242/gunowajowupivebezejoro.pdfIn PDF document text
    • http://seladetitogar.epizy.com/14472176876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e2c8ae6-8fbb-49ad-bab4-e0c87e515883/5th_grade_math_perimeter_worksheets.pdfIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_3502e877ef37474fbeb086505212f108.pdf?index=trueIn PDF document text
    • http://kitomov.epizy.com/lepawikekizizedefevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/134cd702-ff68-4a54-9efa-0b59a7b722d7/falcon_bms_4.34_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/51554716130.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/nadadukikiruloxegajenivom.pdfIn PDF document text
    • http://runoxujozu.rf.gd/gloucestershire_county_council_pension_fund_annual_report.pdfIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_9df7cad721fa49979e83c4601572323a.pdf?index=trueIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_724da07f0f97477289ef9ecbe87e646d.pdf?index=trueIn 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_off0000e038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 5968 bytes
SHA-256: ed9ef0fe6953e6f128369784e7a944933941fe52e0759de2bb8d6459f5959bc4
font_01_sfnt_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 11180 bytes
SHA-256: 95cfff98255a1adeea73aa70a6829289af68c0c00d084b9ecccf24c8b1bdaf2a
font_02_sfnt_off00011a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 16116 bytes
SHA-256: afbdbd02dec82d9be1e07df9ab92004d6e2996c86bdcb9c83a2c1f8ac0d08daa

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