Malicious PDF — malware analysis report

Static analysis result for SHA-256 9320c3ae079d894e…

MALICIOUS

PDF

79.7 KB Created: 2021-04-06 11:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 696bc0fcc0775065f830ae907fc50e1e SHA-1: d37b14d5cba52f55f9c36e8ae3b31d353c388641 SHA-256: 9320c3ae079d894e998922737c1b85377df87525381a9edf7e9dcd9efd5eca58
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=oppositional+defiant+disorder+activities+pdf
    • https://fiwobezamarevev.weebly.com/uploads/1/3/2/7/132740324/d0f48ad.pdf
    • https://gofubajub.weebly.com/uploads/1/3/4/6/134632898/2e220431.pdf
    • http://bifakibebus.iblogger.org/domine_las_aperturas_de_ajedrez_adolivio_capece.pdf
    • https://cdn-cms.f-static.net/uploads/4480905/normal_60500eef203b7.pdf
    • https://static.s123-cdn-static.com/uploads/4369653/normal_5ff681b2eae9d.pdf
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/9074f31dea2d14.pdf
    • http://fojogil.iblogger.org/75491262141.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nelenubo.rf.gd/jaxozifuzonusuvoratix.pdf
    • https://uploads.strikinglycdn.com/files/62ea4012-c365-4545-9c3b-74651247e3f0/lukaxit.pdf
    • https://uploads.strikinglycdn.com/files/3477953d-76a0-4538-80af-b56ddb746fe4/32812394275.pdf
    • https://s3.amazonaws.com/vapite/chandamama_kathalu_telugu_books.pdf
    • https://uploads.strikinglycdn.com/files/00ce3164-3c06-481f-9dde-9df3868cf288/zatozosejowomipagamivi.pdf
    • http://wolebudedo.rf.gd/alpinion_e_cube_7.pdf
    • https://uploads.strikinglycdn.com/files/7d57c701-cddb-4f07-82fd-faae70d7f26d/slow_cook_baked_chicken_breast.pdf
    • https://uploads.strikinglycdn.com/files/f00a8c9a-ec08-420a-84bd-d16185a954c3/journey_to_the_center_of_the_earth_2_full_movie_in_tamil_download_isaimini.pdf
    • https://uploads.strikinglycdn.com/files/c292780a-5131-4ad9-a09e-cb0b867ef71e/what_is_the_structure_of_the_text_the_immortal_ones.pdf
    • https://s3.amazonaws.com/wemazun/what_is_the_scent_of_sandalwood.pdf
    • https://s3.amazonaws.com/baposivarabuj/taxabavadu.pdf
    • https://uploads.strikinglycdn.com/files/ebf3b7cf-d4fe-4151-b54a-4598ec9cd4a4/26353176057.pdf
    • https://s3.amazonaws.com/vetamedisoz/communication_plan_pmi_template.pdf
    • https://uploads.strikinglycdn.com/files/bbb27cc4-aaa7-498c-915f-0693f8e0e87e/twitter_sports_jobs.pdf
    • https://uploads.strikinglycdn.com/files/8f7b7662-e242-42df-ae7c-c0c3ab3a5c1a/dovekuwexawaji.pdf
    • https://s3.amazonaws.com/wizakokowe/how_to_train_your_dragon_homecoming_netflix.pdf
    • http://totepotolijezib.rf.gd/boy_baby_names_in_tamil_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efbf.bin
f3ee54a134fa077d84cd9bf7f884ff62685edf990abfd3894d4c47a8dedd1d33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 5024 bytes
font_01_sfnt_off000100de.bin
d654f262b58e0c9c287a5debdf2eaf8793ea326a04bd3dcefe9a6e165e48032a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 9956 bytes
font_02_sfnt_off000122f1.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122F1 4324 bytes

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