Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc43d6e46aafe81…

MALICIOUS

PDF

79.5 KB Created: 2021-05-18 01:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: da597e3cab9d248821630034634a86b8 SHA-1: 8a80abeaf62597fa6afebd235e5e66e8a97e78dc SHA-256: 8fc43d6e46aafe81416eac64adc32648c61cb5c1d0a7891cf45987037558fd01
126 Risk Score

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/strik?utm_term=giovanni+marradi+piano+sheet+music+pdf PDF link annotation
    • http://bureluvitef.22web.org/21815068297.pdfIn PDF document text
    • http://nafuvexozoli.iblogger.org/guvabatutorekenugi.pdfIn PDF document text
    • http://kubodir.22web.org/dubokesomabikunagazurub.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/71a3d7f9-812a-4b2a-af8b-c219f4cf3025/53095642453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99a7df0-5a31-40c0-b1f9-fe9712490141/wolobesuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e56ee132-1699-4277-bf59-0d599bb44ee9/26008764070.pdfIn PDF document text
    • http://lasusebubev.rf.gd/boulez_domaines.pdfIn PDF document text
    • http://lugixevizopef.epizy.com/actuators_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3c4dc4-7529-44bf-b3c8-d76d4196c975/agatha_christies_poirot_season_1_episode_2_watch_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf97bb53-ca3a-4013-b556-09b8c90bcff3/fetogulolemi.pdfIn PDF document text
    • http://kutegogugilavo.epizy.com/chart_pattern_technical_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/gelaronaninuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f272b30a-b2f4-4b68-a395-0b63adfab521/jimuzomizirul.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/spreadsheet_compare_in_excel.pdfIn PDF document text
    • http://dizodufuxot.rf.gd/judutotewede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3513aec5-61af-4dfd-8af2-e28d4a5ea5c5/47493334416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91fe9a2b-6d0b-4890-99d0-fef4c75e8c7d/mutant_and_masterminds_powers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d89b98-a48e-4e6e-8023-981845908042/pegubelotoxaxafijim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e38cfe27-b825-45f1-89fa-c68787ea35d4/6-1_practice_properties_of_exponents_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2093b461-2967-424f-aed4-fc0823d7f304/pegasus_upc_faucet_parts.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_off0000ea94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 5336 bytes
SHA-256: 6ec8cd2c12237ec609b43263a783a56408ffbd8a299826302ca8a95ec2fa359f
font_01_sfnt_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 11112 bytes
SHA-256: ce4d53c546ac6fc20a688041e3ac246a3621f3822631ad2223323630fe64778b
font_02_sfnt_off00012267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12267 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71