Malicious PDF — malware analysis report

Static analysis result for SHA-256 a340f15dd3c2fd9f…

MALICIOUS

PDF

86.8 KB Created: 2021-04-06 14:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 610aba9e7d30b8ce89ab233b8683838e SHA-1: 6ccaa45c504978bc32ab632ed27fc8f83b893a6a SHA-256: a340f15dd3c2fd9f7c84e6a22aaf01855a071fd6f2c1bae3505f8ff5755b2a7b
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://kuzutuzo.ru/123?utm_term=akuntansi+pemerintah+daerah+pdf PDF link annotation
    • http://bilkaita.space/raghuvaran_b_tech_movie_hdswk6k.pdfIn PDF document text
    • http://edalovert.xyz/ala_baburao_ala_baburao_songr20cg.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/brand_design_ruud_boer6j8z7.pdfIn PDF document text
    • http://jukejed.mypressonline.com/good_riddance_green_day_piano.pdfIn PDF document text
    • http://moreprodukti.com/how_to_set_armitron_pro_sport_watch2cjy8.pdfIn PDF document text
    • http://kugitipozad.22web.org/airfoillabs_king_air_350_manual.pdfIn PDF document text
    • http://nupesupo.mypressonline.com/past_tense_words.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
    • http://dowuvoduwitovos.atwebpages.com/83480559360.pdfIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_6a03e63c0b1b41b2a2071c6bc2c82bed.pdf?index=trueIn PDF document text
    • https://ad5375d1-0dc8-447d-a54b-f1659eeba1ba.filesusr.com/ugd/a4ba79_ac1cfc78d1e3485dafb8833ce926b055.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3e988e1-5e07-4944-9a76-fc10e8d2d831/gokuwenubuwusi.pdfIn PDF document text
    • http://xabudavadeguvo.myartsonline.com/can_you_track_a_usps_letter.pdfIn PDF document text
    • http://fekivefutetowet.rf.gd/64457501125.pdfIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_18977807a346429293959d092426908a.pdf?index=trueIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_adb30a87f7074955ba9635f01181f856.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8684190e-ecd1-463c-af1d-8cbad2b5aaa5/samsung_55_inch_4k_ultra_hd_smart_tv_un55mu6300f.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e14d7d-ce5d-44c4-b433-ed74ab29535a/tipo_de_archivo_para_subir_videos_a_instagram.pdfIn PDF document text
    • http://sanojepenot.onlinewebshop.net/refatinozujubejusonuxir.pdfIn PDF document text
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_f56564260cfc4042b9a2b43d0e1142f5.pdf?index=trueIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_f56f4146125647e0bc3999a1a12d802f.pdf?index=trueIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_f49e493d0b0c4391b3599cb8e14d8d59.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/552c8ffa-4e02-4117-a9ac-af654cfa7c7a/26369724780.pdfIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_7b63feba9b8147cb9514867778df3243.pdf?index=trueIn PDF document text
    • http://zapizuw.rf.gd/6022031078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea9eefa-95fe-47a6-91ec-9e4d4f050d6c/how_to_fold_heart_with_square_paper.pdfIn PDF document text
    • http://nomekerileme.epizy.com/ciaccona_bach_busoni.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_off0001076c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 5072 bytes
SHA-256: 06c8c03badab0ca2fe92e8923b6627a945e4b47185bf475cfd5ff8d03303cf31
font_01_sfnt_off00011873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 11404 bytes
SHA-256: 1a7cb32ed214001ec215f2049a974ced959ec786a900bd497712c7d536a7d234
font_02_sfnt_off00013f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F72 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e