Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ddeef996b223cf…

MALICIOUS

PDF

82.7 KB Created: 2021-03-29 12:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f07c6dfe762b4d339929515761a1a37c SHA-1: d7e971b0ab9e826f6025cd0883a6c490d5769425 SHA-256: 91ddeef996b223cf483c86062fe927112303a00ced942475729dac72ee616cfc
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/123?utm_term=capillary+fragility+test+pdf PDF link annotation
    • https://debozapo.weebly.com/uploads/1/3/1/1/131164198/709109.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/MKjeicZ/nijuvonamipijumugiwo.pdfIn PDF document text
    • http://viwimewi.22web.org/49847121299.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/jejusufugemem.pdfIn PDF document text
    • http://predouche.xyz/uppababy_mesa_car_seat_install_latchwky54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475572/normal_5ff1b3ffd5e11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454672/normal_605f2a30430c4.pdfIn PDF document text
    • http://thesimplycompleteseries.com/como_jogar_monopolyz7nq8.pdfIn PDF document text
    • https://guxiwuwo.weebly.com/uploads/1/3/1/0/131070036/filefakesexinufuxixi.pdfIn PDF document text
    • https://kipowiginudi.weebly.com/uploads/1/3/1/3/131383469/gefowipibobemikotuzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_6052fa7619ba8.pdfIn PDF document text
    • https://toxoladosa.weebly.com/uploads/1/3/4/4/134479392/retekojawoji_jiketupo.pdfIn PDF document text
    • https://jekufagiz.weebly.com/uploads/1/3/0/7/130739150/berorosapisesuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422637/normal_604d2fe1c2a43.pdfIn PDF document text
    • http://santaparker.store/digital_marketing_courses_online_canadamh4fh.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/rifujevizedo.pdfIn PDF document text
    • https://cdn.sqhk.co/nadokikado/iHa0gdP/luzewuworasotupejufedipe.pdfIn PDF document text
    • http://wowit.pro/estadistica_descriptiva_cordovasta6a.pdfIn PDF document text
    • https://jubiwaxu.weebly.com/uploads/1/3/4/6/134645567/bipebire_kipawu_valajurudelir.pdfIn PDF document text
    • https://tutiwelureno.weebly.com/uploads/1/3/4/7/134714557/f2969.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/Bujbfwt/cosmo_and_wanda_crown_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414169/normal_5fe3edc525192.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/eVzOhjH/38514840728.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wupejuxudeg.rf.gd/gabojif.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_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 5216 bytes
SHA-256: 705da4fd6fec342a4dc8e29168ee9fd6cb8b0d4437fe6ae2255a29933bac1eba
font_01_sfnt_off00011622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11622 11700 bytes
SHA-256: c750ad860b4d22fdc046c4df2a58e390b1729bf2a404a027f58c551b112fb885