Malicious PDF — malware analysis report

Static analysis result for SHA-256 320a7b86fac4f53d…

MALICIOUS

PDF

93.1 KB Created: 2021-03-17 21:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ed503ff14d882de8e3fee7ce5a0bd3de SHA-1: 170a32834dd21c93e7a625edcb839260d89bf1c9 SHA-256: 320a7b86fac4f53dfe7966601f5a78aec566313f31364f2f8a6e6f4bded04768
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 0.9997

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://botokaw.ru/award?keyword=chromatic+aberration+physics+pdf PDF link annotation
    • http://dalidusiz.mywebcommunity.org/wufuzilasizivazob.pdfIn PDF document text
    • http://wilitubejibo.iblogger.org/42553064418.pdfIn PDF document text
    • http://nopezimugabotik.mygamesonline.org/the_night_frederic_malle_sample.pdfIn PDF document text
    • http://nibewubixela.getenjoyment.net/carmex_tools.pdfIn PDF document text
    • http://mufinofol.scienceontheweb.net/94353176183.pdfIn PDF document text
    • http://nipawifaxupus.mygamesonline.org/88035909640.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_4e5cae3c7d0f4e2d959929309c315e48.pdf?index=trueIn PDF document text
    • http://kekerojuxofex.epizy.com/dazafotutudimojo.pdfIn PDF document text
    • http://bozolukiket.epizy.com/jaxijesi.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/78904248250.pdfIn PDF document text
    • http://pezamax.myartsonline.com/nutrition_an_applied_approach_3rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/tuxozigajulajumigovof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acddecbb-73e8-42bc-b6d3-fd936a770cc6/best_stock_trading_app_for_beginners_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/fumiris.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cffd4734-a24d-48e8-a171-8d6796dcaafe/rulozod.pdfIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_b4e94d92a92c44c48e76ff6720783475.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/38723121962.pdfIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_ea25e7a3b44c4ccfb907491ae11e78e3.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_off00011728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11728 5512 bytes
SHA-256: bc822cb24f771ffe66abbfb514fb8c4fddea317abaed6105c4431cf740db7ccc
font_01_sfnt_off000129b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B1 12192 bytes
SHA-256: dfd858cd65d25fa1b4212f396b2cb76e36e1644d3877f5a17afd6e2f4b068553
font_02_sfnt_off0001529d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1529D 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727

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