Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5590983806c52d…

MALICIOUS

PDF

78.4 KB Created: 2021-06-09 04:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ebd717540e6136ea05e274d9dfe2d879 SHA-1: 80e96f17b8c1844e1cf0a069517b1e04c988c877 SHA-256: 1c5590983806c52d1ad649d828a4b745af838cce957c60721cf30db74bdc16eb
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The primary lure appears to be 'Autodesk quantity takeoff download', suggesting a phishing or scam attempt. The presence of a PDF_SEO_LINK_FARM heuristic firing and a high ML score indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://coretry.ru/pbw?utm_term=autodesk+quantity+takeoff+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389823/normal_6006f6750addb.pdfIn PDF document text
    • https://guxumexowe.weebly.com/uploads/1/3/3/9/133999944/zogetudolesubar_sezifo.pdfIn PDF document text
    • https://bugituwixumanuz.weebly.com/uploads/1/3/4/7/134722584/gerak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_60523171d8c5a.pdfIn PDF document text
    • https://mikedexe.weebly.com/uploads/1/3/1/4/131452733/gigizivalizavul_dalov_potikezixubadi_fafemodotezib.pdfIn PDF document text
    • https://jaluwaxigesife.weebly.com/uploads/1/3/4/6/134640648/2954888.pdfIn PDF document text
    • https://gilivederediwo.weebly.com/uploads/1/3/4/6/134683856/giludupi.pdfIn PDF document text
    • https://xutepokukofegik.weebly.com/uploads/1/3/5/3/135391302/basagofupi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464722/normal_605b1019cd665.pdfIn PDF document text
    • https://razasojesiwanet.weebly.com/uploads/1/3/4/3/134377469/tudowudunojeme_dilase_zepoxa_kilunizazisovuj.pdfIn PDF document text
    • https://jawifimubagibe.weebly.com/uploads/1/3/4/3/134310986/3eab1d48ed.pdfIn PDF document text
    • https://dutumeparozawa.weebly.com/uploads/1/3/1/1/131163590/2507525.pdfIn PDF document text
    • https://nitikado.weebly.com/uploads/1/3/4/6/134660078/jowivem-vutisinema-seritudutixi-lagegejuxasepes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gufabewa.pbworks.com/f/12234594763.pdfIn PDF document text
    • http://gegoxelaw.pbworks.com/w/file/fetch/144596724/how_do_i_get_my_mac_to_recognize_my_second_monitor.pdfIn PDF document text
    • http://wozixokumo.pbworks.com/w/file/fetch/144431763/8225194538.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/88232155038.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/w/file/fetch/144907644/gta_v_online_how_to_get_in_a_public_session_by_yourself.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/f/accountancy_specific_project_for_class_12_cbse_2020-21.pdfIn PDF document text
    • http://molitutolu.pbworks.com/f/descargar_clash_of_souls.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144877470/boyka_undisputed_4_yts.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/w/file/fetch/144455067/95366988648.pdfIn PDF document text
    • http://mofarires.pbworks.com/f/39463575174.pdfIn PDF document text
    • http://lowigamivux.pbworks.com/f/how_to_enter_log_base_in_webwork.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_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 5176 bytes
SHA-256: 5d8a2102e237c063a4a58d846791ffd5541e58bdcb8a66e6f525a4b27a31d4cf
font_01_sfnt_off000106cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CF 10964 bytes
SHA-256: 671af837b64f143508db92e20b50a5c2da159106f105eb8ec4dd7947684918a6