Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ecdd0383623fcb…

MALICIOUS

PDF

84.4 KB Created: 2021-06-07 06:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f032473036b62475d8cb8d3e9804f809 SHA-1: dbbdc5fe14adab0647c892966e77a677ef48dcbb SHA-256: 43ecdd0383623fcbe141450613750dc6df14f2ce76ba23efdb523574f5c34ab4
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 pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/123?utm_term=miocardiopatia+dilatada+pdf+2018 PDF link annotation
    • https://jexiliwole.weebly.com/uploads/1/3/0/7/130739190/bevebazu.pdfIn PDF document text
    • https://litiwufedoza.weebly.com/uploads/1/3/0/7/130739575/mosojedoliz.pdfIn PDF document text
    • https://pisaxegeb.weebly.com/uploads/1/3/0/7/130775455/bf0eb5.pdfIn PDF document text
    • https://wajotirege.weebly.com/uploads/1/3/5/3/135306859/gazatupekog_nulabedozajejuk_welanu.pdfIn PDF document text
    • https://vozuzuxe.weebly.com/uploads/1/3/4/3/134314749/vubidizataviriz.pdfIn PDF document text
    • https://jafufikatovovew.weebly.com/uploads/1/3/4/4/134481731/guwudisufivato_juxujuzudenok_kisufamov_pigibepu.pdfIn PDF document text
    • https://sifixibufe.weebly.com/uploads/1/3/4/3/134348909/8599928.pdfIn PDF document text
    • https://nivejuva.weebly.com/uploads/1/3/4/7/134713874/cebc0b96988.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://gudikijuruf.pbworks.com/f/que_es_la_informacion_genetica.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/f/33331087913.pdfIn PDF document text
    • http://wejojixi.pbworks.com/f/vewisotomosozebutuvaf.pdfIn PDF document text
    • http://dokajawema.pbworks.com/w/file/fetch/144756858/how_to_cite_in_mla_in_paper.pdfIn PDF document text
    • http://kedefoviraj.pbworks.com/w/file/fetch/144614040/kirukadokubirugotuzowulu.pdfIn PDF document text
    • http://xuwajesorewo.pbworks.com/f/2140296228.pdfIn PDF document text
    • http://xokizobaf.pbworks.com/f/livro_parasitologia_humana_download.pdfIn PDF document text
    • http://tebejeloxid.pbworks.com/w/file/fetch/144423396/29694061926.pdfIn PDF document text
    • http://zezimin.pbworks.com/w/file/fetch/144412257/the_measure_of_man_and_woman_human_factors_in_design.pdfIn PDF document text
    • http://sulegiwi.pbworks.com/w/file/fetch/144683115/what_molecular_shape_is_always_polar.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/w/file/fetch/144460632/swiffer_wet_jet_pad_instructions.pdfIn PDF document text
    • http://letonepamusi.pbworks.com/f/44485409045.pdfIn PDF document text
    • http://kizisoj.pbworks.com/f/what_is_a_digital_asset_management_system.pdfIn PDF document text
    • http://mevuteled.pbworks.com/w/file/fetch/144618351/dungeons_and_dragons_5e_character_sheet_editable.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/f/idmss_plus_android_download.pdfIn PDF document text
    • http://vixifalino.pbworks.com/f/78114637315.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/f/god_of_war_ghost_of_sparta_full_game_download_for_android.pdfIn PDF document text
    • http://kesowununak.pbworks.com/w/file/fetch/144735849/73966451970.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_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 5060 bytes
SHA-256: 69753b28e480bdabd66314b09fd52091616786f9aee4cbfc10541031c766fb17
font_01_sfnt_off00010dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD8 11568 bytes
SHA-256: 6bc37c7b1819df03761855f474e8ccef9f0e01e8178745ea272b21ff882c4936
font_02_sfnt_off000133d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176