Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f3ca1e2e295050…

MALICIOUS

PDF

84.8 KB Created: 2021-05-01 16:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 37a29421607a815b425c3da155c22cd9 SHA-1: d71835a9d2a7b292fec28e06319983674d7b3f1d SHA-256: a8f3ca1e2e295050c14c2d2231a46fc97701556da6975cba67c2f95fec02c40d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs, suggesting a phishing or malware distribution scheme. The document body, though heavily garbled, contains text related to 'Diccionario ingles español y pronunciacion pdf', which appears to be a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=diccionario+ingles+espa%25C3%25B1ol+y+pronunciacion+pdf PDF link annotation
    • https://xibabajawaxas.weebly.com/uploads/1/3/1/3/131398380/788fdac9.pdfIn PDF document text
    • http://zarewubizeno.mywebcommunity.org/shadows_over_bogenhafen_cosmetics.pdfIn PDF document text
    • https://vuligezu.weebly.com/uploads/1/3/5/3/135391643/6318392.pdfIn PDF document text
    • https://legorigerelok.weebly.com/uploads/1/3/6/0/136056749/pasarozofipimedom.pdfIn PDF document text
    • https://manabuvajej.weebly.com/uploads/1/3/4/8/134847277/muzobiwudulidawid.pdfIn PDF document text
    • http://tanivikovome.sportsontheweb.net/65588549233.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/a36197f3d54.pdfIn PDF document text
    • http://nibewubixela.getenjoyment.net/antifungal_activity_of_silver_nanoparticles.pdfIn PDF document text
    • http://xesepoxobij.22web.org/chaffoteaux_inoa_green_24_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/nebemina/qihgggg/police_light_sound_app.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/topilawevajizereza.pdfIn PDF document text
    • http://somixewavado.sportsontheweb.net/alcatel_pop_4_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/jebavimot/cjiijij/gartner_rpa_magic_quadrant_2019.pdfIn PDF document text
    • http://peguxukeziku.sportsontheweb.net/adolescent_health_care_a_practical_guide.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/5648870041.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://peburidil.epizy.com/modifys_for_free.pdfIn PDF document text
    • http://vovakupalujum.onlinewebshop.net/surah_ar_rahman_full_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/rafarugezusudezonolubunu.pdfIn PDF document text
    • http://nevuvomadibavid.epizy.com/bosch_300_series_dryer_dryness_level.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/bahubali_1_film_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/sovigenagopusuj.pdfIn PDF document text
    • http://zokitamuna.epizy.com/consumer_affairs_owners_corporation_proxy_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/8008933218.pdfIn PDF document text
    • http://davofunup.onlinewebshop.net/bsria_bg6.pdfIn PDF document text
    • http://koduwutuvage.onlinewebshop.net/gadopakefoliz.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/remstar_plus_m_series_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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 5636 bytes
SHA-256: 43cf80fd7d73dd4f856e3b81bdd50d5275f35ec2063ccf44f06ffc7d277cc594
font_01_sfnt_off00010643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10643 12012 bytes
SHA-256: 0ca6a10527e51f8aa6864968530db575ede4da075405574e5d0b2ca8f89ac542
font_02_sfnt_off00012d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D89 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e