Malicious PDF — malware analysis report

Static analysis result for SHA-256 4276804b093aa2cc…

MALICIOUS

PDF

68.9 KB Created: 2021-03-24 08:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c482deb44c19862912d45ed6e4ccc3cc SHA-1: ad36ba155f54f3f2bbecbb29896eabe0b5dd2e8c SHA-256: 4276804b093aa2cce9fbea4a62b5343b880d9df4f4c3ecc33bf2a0035c149e07
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically a phishing or trojan payload. The embedded URLs, such as 'https://resalured.ru/123?utm_term=self+assessment+library+en+espa%25C3%25B1ol+pdf', are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://resalured.ru/123?utm_term=self+assessment+library+en+espa%25C3%25B1ol+pdf
    • http://blubadgehelp.net/ver_pelcula_completa_en_espaol_los_hermanos_karamazov_youtubeu1kxg.pdf
    • http://getporte.xyz/cisco_switch_vlan_configuration_commands6uxrv.pdf
    • http://cosmosqrab.online/38947593888kxmtk.pdf
    • http://girlita.space/lubupafilosulurawinoviggy6hc.pdf
    • http://it50off.pro/dewalt_dwe7491rs_table_sawe7irv.pdf
    • http://parralax.net/college_english_101_reading_listq4cw5.pdf
    • http://stal-kemerovo.ru/lucky_life_8_reviews29jhr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_8147df2661834540b877c9b1359df3b6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d224d40b-a26c-4ce6-b629-471f16e25fcf/58088708981.pdf
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_50672d1be3bb4760babee79a48912b9e.pdf?index=true
    • https://s3.amazonaws.com/pafexegud/89421133764.pdf
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_4a2b8d1718cd4cedbbd0d1658e57337b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0a55e18b-ce36-40d7-8066-1136e8159363/dotabugijutibogun.pdf
    • https://uploads.strikinglycdn.com/files/193d16b7-b64f-4bff-b6c2-fe90285463d9/baby_einstein_jumper_replacement_parts_uk.pdf
    • https://uploads.strikinglycdn.com/files/005a8ac4-b01e-4a4f-abf6-cc11db51de9f/5_dysfunctions_of_a_team_chapter_summary.pdf
    • https://uploads.strikinglycdn.com/files/6643b622-86f7-437b-bd12-dd9dacd40f33/xixalajaveresat.pdf
    • https://s3.amazonaws.com/najubu/bharat_movie_free_movies_counter.pdf
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_3d63e5600bee44e2a14804a7a1dab551.pdf?index=true
    • https://s3.amazonaws.com/befarekogol/captive_prince_book_3_epub.pdf
    • https://uploads.strikinglycdn.com/files/1f21297c-ddee-4cb9-bf5a-342ac652a4bc/leadership_and_self_deception_free_download.pdf
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_24c9b11614d34739811c954212412f97.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8a8018de-2c2c-40b7-ac98-254b3a56b913/43136152650.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf51.bin
6dbd516af345aac2052c9306e47216b570ff5aa4c003c7d750f4f3728064fc0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF51 5744 bytes
font_01_sfnt_off0000e286.bin
beafe5dd3eb2f4d3d1df754bf54c95883c4ec409cf9a22b66dcfccdf6859b7de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 9816 bytes

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