Malicious PDF — malware analysis report

Static analysis result for SHA-256 21322e6f8ea98eb6…

MALICIOUS

PDF

80.4 KB Created: 2021-04-07 01:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 99a2a7b98157ab53517df6d5baad864b SHA-1: 564626feb2723c0980b2c44838e342834626e547 SHA-256: 21322e6f8ea98eb6b153ca2a57afbd6b79770f258b3d446218895c01683106e7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/award?keyword=estudio+descriptivo+sampieri+pdf PDF link annotation
    • http://kazotapojiwi.mywebcommunity.org/3717202090.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/hdBijgg/glitter_wallpaper_for_iphone_7_plus.pdfIn PDF document text
    • http://it50life.pro/22233128697whqx6.pdfIn PDF document text
    • http://mitisavad.getenjoyment.net/american_heart_association_low_cholesterol_diet.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/challenges_in_teaching_english_language_learners_in_the_classroom.pdfIn PDF document text
    • https://cdn.sqhk.co/naxaroja/cg8iiha/4788962231.pdfIn PDF document text
    • https://cdn.sqhk.co/dupeguwova/hc9ciea/802_east_front_street_plainfield_nj.pdfIn PDF document text
    • http://tixaman.scienceontheweb.net/modelo_de_hoja_de_inventario_en_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/vm5jaie/duck_game_color_schedule_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/ifFgfjc/18038259357.pdfIn PDF document text
    • http://sibuvre.com/602767575169xubi.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/7rgfd2i/human_fall_flat_levels_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/voduzetefir/jJmZRxI/pupop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_e0b71356889647e09c8d6175514685c0.pdf?index=trueIn PDF document text
    • http://kegigija.atwebpages.com/dakes_annotated_reference_bible_app.pdfIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_ba1bb9042a3848ba8c9e7de922b4ffa2.pdf?index=trueIn PDF document text
    • http://dexizijisub.atwebpages.com/cmon_rising_sun_rules.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_6043e6c266d04245bff7a1ced0192902.pdf?index=trueIn PDF document text
    • http://tiwatimab.atwebpages.com/american_dream_in_death_of_a_salesman_research_paper.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_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 5284 bytes
SHA-256: 398e07b196fa4652a97ffce1ceaca283de54a941611a7704c89729fa5bb7f7e8
font_01_sfnt_off00010b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 12216 bytes
SHA-256: 8aefdb77d6c3e3a217aa11c3c71fa23ab0c52334f4daa5e0f00f1637ad3379e9

Open this report in the interactive analyzer, or submit your own file for analysis.