Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8f7e688e49dbfe…

MALICIOUS

PDF

81.7 KB Created: 2021-03-19 08:20:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 18fa1437c93af84062f27dcc2f6ff183 SHA-1: 06e506c175662df1b9f2ff11202ec0cc35409091 SHA-256: ef8f7e688e49dbfe562325506d3adf7363ca6ddc9e05739344acd9bb8a0df689
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate that the primary function is to redirect users to potentially malicious external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/wix?keyword=honda+2000i+generator+specs PDF link annotation
    • https://mowasedexalobir.weebly.com/uploads/1/3/4/7/134743102/xititenox_wajazi.pdfIn PDF document text
    • https://cdn.sqhk.co/masezupusi/cnij5Y9/tejoxapegififanax.pdfIn PDF document text
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/xovib.pdfIn PDF document text
    • https://xojobade.weebly.com/uploads/1/3/4/3/134385351/zuxubamad_malofonomewufe_mesigu_musiwakoxitafoz.pdfIn PDF document text
    • https://verijijul.weebly.com/uploads/1/3/4/8/134861220/kugidotisuxeroxudu.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/48317088966.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobuwaxegu/1Usaigg/megatube_motorcycle_singapore.pdfIn PDF document text
    • https://gavokafiwafez.weebly.com/uploads/1/3/1/3/131381231/6486574.pdfIn PDF document text
    • http://gopubewigofopa.iblogger.org/history_of_catalonia.pdfIn PDF document text
    • https://dejewetekexofig.weebly.com/uploads/1/3/0/7/130775583/6662638.pdfIn PDF document text
    • https://latufuxi.weebly.com/uploads/1/3/1/1/131163666/0888d0268141.pdfIn PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/4374877.pdfIn PDF document text
    • https://cdn.sqhk.co/totuzilexif/gfJDii3/bamowolakanuvut.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/crkEkjg/voltage_drop_formula_for_single_phase_cable.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/dhj2WSU/83113881589.pdfIn PDF document text
    • https://gavixidosoxadi.weebly.com/uploads/1/3/0/7/130776067/gepagatidet.pdfIn PDF document text
    • https://daputonekamipit.weebly.com/uploads/1/3/0/7/130775603/demogimidegebit_guwipanus_fijofewer_wozesode.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/el_sistema_endocrino_esta_formado.pdfIn PDF document text
    • http://gujafitixa.iblogger.org/724757579.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://ropupifalapoges.atwebpages.com/67333805358.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/boi_online_form_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/48649835769.pdfIn PDF document text
    • http://tofepabozamawur.epizy.com/soundlogic_xt_power_bank_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/65328169268.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_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 5232 bytes
SHA-256: 348d95e536376c6c2274c1cd288653b6eb4f21ad4ae6c06d251fdd739c7085fe
font_01_sfnt_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 11924 bytes
SHA-256: 8819fa7da7a91b2f2716c10b41bec3c10795561c3a190a6daef1abba15346562
font_02_sfnt_off000129db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DB 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333