Malicious PDF — malware analysis report

Static analysis result for SHA-256 753dc899bb2fbaf4…

MALICIOUS

PDF

76.6 KB Created: 2021-04-30 07:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8c8aff1b4b914ab5840637e9c7fe93b3 SHA-1: aca9d73c229995d0cdc67b8a471b49ba60c8e653 SHA-256: 753dc899bb2fbaf4aa5d254b6a9d3bb3e1cf5df64b095cf5c12a6cc6c81db09f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded URLs and the document's structure point towards a tactic of using seemingly legitimate search result content to mask malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=how+to+get+legally+married+in+indiana PDF link annotation
    • https://cdn.sqhk.co/nilajinipur/L1hc9EF/performance_review_overall_comments_sample.pdfIn PDF document text
    • https://tilemutafadat.weebly.com/uploads/1/3/1/8/131856023/2878270.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxunoromi/oYhdCnC/jaton.pdfIn PDF document text
    • https://cdn.sqhk.co/ginonunujiji/hbhbRoG/classic_wow_tribal_leatherworking_guide.pdfIn PDF document text
    • http://bipowilago.mywebcommunity.org/20753213816.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/27069702070.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/21840707024.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/kenneth_cole_watch.pdfIn PDF document text
    • https://cdn.sqhk.co/nikajovefer/hdhbhjD/95178440459.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/njiUicQ/ez_recharger_mobile_recharge_top_up.pdfIn PDF document text
    • http://pivolirarorip.mypressonline.com/zuxiv.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/hcBjfid/fireman_carry_woman.pdfIn PDF document text
    • https://cdn.sqhk.co/lomekojop/oiariir/pivusixa.pdfIn PDF document text
    • http://levotavo.scienceontheweb.net/prefix_and_suffix_worksheets_with_answers_doc.pdfIn PDF document text
    • https://litepuvib.weebly.com/uploads/1/3/4/7/134741427/3f2f11a.pdfIn PDF document text
    • http://kafidovomiguvo.mywebcommunity.org/56022526413.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lefemijip/anemia_falciforme_tem_cura.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/32797673373.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/73297749605.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/76348588655.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/indian_chicken_curry_recipe_madhur_jaffrey.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/the_coenzyme_forms_of_niacin_include.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_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 5124 bytes
SHA-256: 40ee9d6481d0cee80038c068239c1ba6b3896766894174b41bb459f1066dd687
font_01_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 10688 bytes
SHA-256: fed3da63b5123b1df3a5d2e1c12bd3eae8c932da5daeaa7e70b547f7b6d704e2

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