Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d118d043733d53…

MALICIOUS

PDF

73.3 KB Created: 2021-04-01 05:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 16bb15c8763ae116ba2539e699ac7df8 SHA-1: e705c9b69089b7092d1c07c1454b1ff8f7b0e961 SHA-256: 45d118d043733d53fadabef3e77427bf216953e4093d6235fe27a34bb761e9ab
166 Risk Score

Malware Insights

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

This PDF document contains multiple heuristics indicating malicious intent, including an invisible link to a suspicious domain and classification as a phishing trojan by ClamAV. The ML classifier also strongly flagged it as malicious. The document's content, though heavily obfuscated, appears to be a lure related to 'back pain while pregnant', directing users to external URLs that are likely part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://maypoin.ru/strik?utm_term=how+to+help+with+back+pain+while+pregnant PDF link annotation
    • http://lnstagram-support.live/kubuguwaqvvm.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/cfdefb3b.pdfIn PDF document text
    • http://lulodexov.scienceontheweb.net/define_development_planning.pdfIn PDF document text
    • http://vadosixajobirug.mygamesonline.org/divezu.pdfIn PDF document text
    • https://dazifonawifebi.weebly.com/uploads/1/3/4/7/134763946/pobinuketegerus-petosomotuman.pdfIn PDF document text
    • http://fakosujonipej.iblogger.org/lasuwikaxewevamamemivogu.pdfIn PDF document text
    • https://ludebopukum.weebly.com/uploads/1/3/1/3/131380916/2104817.pdfIn PDF document text
    • https://jetezilim.weebly.com/uploads/1/3/0/7/130775858/80eb4323b12d.pdfIn PDF document text
    • http://bomufofo.iblogger.org/how_to_boarding_pass_spicejet.pdfIn PDF document text
    • http://tokio-2020.fun/5944568941uvsmw.pdfIn PDF document text
    • http://wevibakudibu.iblogger.org/bialik_high_school_uniform.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/sapper_handbook_for_sale.pdfIn PDF document text
    • http://telgrm.site/1997_chevrolet_s10_owners_manualnu558.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/fepud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lobamanomevid.rf.gd/74088591763.pdfIn PDF document text
    • http://dakovemusurevo.epizy.com/gis_spatial_analysis_and_modeling.pdfIn PDF document text
    • http://kenesowozowojaw.myartsonline.com/dagazivifutovijijexu.pdfIn PDF document text
    • http://zejawira.rf.gd/87559236953.pdfIn PDF document text
    • http://xogijowag.onlinewebshop.net/95002973572.pdfIn PDF document text
    • http://xozesaf.rf.gd/the_best_science_fiction_books_2018.pdfIn PDF document text
    • http://dogufisojorosef.epizy.com/robot_floor_mop_reviews_uk.pdfIn PDF document text
    • http://sodowurivav.onlinewebshop.net/importance_of_fixed_asset_management.pdfIn PDF document text
    • http://dujazenemelix.epizy.com/appointment_letter_format_for_design_engineer.pdfIn PDF document text
    • http://vowojuxibaxo.myartsonline.com/all_shayari_download.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_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 5276 bytes
SHA-256: ac52c8b5193fbb4dfffaeaed76ab16dbf4519e81bda3641a58fc74a26204b3c4
font_01_sfnt_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 10176 bytes
SHA-256: 8fb19bad97a746e0f880c5bdc8be3f47e31ac6326c22634ce50ffc816a682b0b

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