Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b9aaa4e1b2c0a0…

MALICIOUS

PDF

67.5 KB Created: 2021-03-29 21:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ccaf1ac05aab2d7c4f0dfe9c0a017089 SHA-1: 547d2f3a57d80313ff4125c7132d9ec1e1d1fce0 SHA-256: b6b9aaa4e1b2c0a0320ab20499f796b6bdae99c540df1e88dab89b9b08d6453d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://dugedepap.ru/award?keyword=biffi+pneumatic+actuator+pdf PDF link annotation
    • https://nubipudovolena.weebly.com/uploads/1/3/4/0/134012318/samab.pdfIn PDF document text
    • http://fruitik.space/harsh_mohan_textbook_of_pathology_8th_editionp6gbl.pdfIn PDF document text
    • https://tixuguzuw.weebly.com/uploads/1/3/4/0/134096155/duxavit_jasudebudovi.pdfIn PDF document text
    • http://vumajuzatijerak.getenjoyment.net/dekixujugerudujide.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/lugiposo.pdfIn PDF document text
    • http://spain50off.info/download_movie_maker_win_10_full_crackyawm8.pdfIn PDF document text
    • https://bikewodeganesu.weebly.com/uploads/1/3/4/5/134596115/4796099.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483365/normal_604460c3a32d4.pdfIn PDF document text
    • http://zabavnyi-slon.ru/what_is_american_literature_definition2zxp8.pdfIn PDF document text
    • https://tasimaxexakopox.weebly.com/uploads/1/3/2/6/132681882/9228035.pdfIn PDF document text
    • https://lemorixumo.weebly.com/uploads/1/3/4/7/134748879/7a0e6ebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495387/normal_60431885a390d.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/63069392827.pdfIn PDF document text
    • https://selilanabos.weebly.com/uploads/1/3/4/8/134875664/bukegi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485572/normal_601179231b724.pdfIn PDF document text
    • http://tazanup.mypressonline.com/wiczenia_po_endoprotezie_stawu_biodrowego.pdfIn PDF document text
    • https://sovufejado.weebly.com/uploads/1/3/0/7/130740048/4604821.pdfIn PDF document text
    • https://ligiponofejejo.weebly.com/uploads/1/3/4/3/134346234/1324634.pdfIn PDF document text
    • http://lobafor.mypressonline.com/85451802663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_602ddec0cf98a.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/23238170501.pdfIn PDF document text
    • http://supfitket.buzz/mastercraft_2020_xstarn4rtk.pdfIn PDF document text
    • http://maxobujixeweden.sportsontheweb.net/5038146779.pdfIn PDF document text
    • https://vafuzetok.weebly.com/uploads/1/3/2/7/132740798/4441594.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/dewalt_18v_battery_in_14.4_v_tool.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_off0000cc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC49 5140 bytes
SHA-256: e365d308817fe2e0d17948840b4618482c7c12c3c1a2ceb5b412fc0a1956df55
font_01_sfnt_off0000ddae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 10372 bytes
SHA-256: ce4fcd1794f1d3f2be39854fada9fbfbd908b939e805a1f2a5657e7e8bc122c3