Malicious PDF — malware analysis report

Static analysis result for SHA-256 d526866b40187078…

MALICIOUS

PDF

85.2 KB Created: 2021-03-31 06:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d71042e53e6e6467ab720c0231781263 SHA-1: 6993bc84875153dbe16afcd36e5550a68aa85d63 SHA-256: d526866b40187078a8f1691dcac1a2017342c48bb9b1123d29472f9c8f612293
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, many pointing to disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=tipos+de+anemia+ferropenica+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477620/normal_5ff370331e170.pdfIn PDF document text
    • http://hustlinmoney.com/25339936149wlatd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445879/normal_602cade7331bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_601473818750a.pdfIn PDF document text
    • http://wisecreditscore.info/how_many_days_a_week_do_you_need_to_work_out_to_see_resultsft6cb.pdfIn PDF document text
    • http://playmarket-online.com/83148459188inph0.pdfIn PDF document text
    • http://ifeelgood.club/braun_series_7_790-cc4_shaver_reviewcfxa4.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/nails_salon_for_salerwoy2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460055/normal_60489ed732b76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457014/normal_606012acf3d36.pdfIn PDF document text
    • http://curvepreloved.com/mitosis_coloring_activity_answers3a13k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8f1ef4f7-3f23-41ef-a3d6-4e5873a175a2.filesusr.com/ugd/d318ce_79103639a0b14869b4c1dd81a492c5ef.pdf?index=trueIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_fbb0f43842474d66813fde8f9a6bb626.pdf?index=trueIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_5d953f3c035b49d9a565ffa4c8e69461.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_1b36ac899d6247c6b54c504ac74f99d3.pdf?index=trueIn PDF document text
    • https://e321b6f2-2a0a-4c58-8c60-26baf46d82f1.filesusr.com/ugd/14900c_374f7ab6aa46491da26a1696ca4d23aa.pdf?index=trueIn PDF document text
    • https://cb0508fd-2a1f-4901-a161-a76823ee8e4f.filesusr.com/ugd/52013e_9d049db36ce34b7e883299f70816e951.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_d1512d6dd50a40c9b82f7728b24746be.pdf?index=trueIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_9230e33cd62b4b9fb00a9f71d9b44124.pdf?index=trueIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_ac4969f0f6ab4ce4af6438f90fba8a9d.pdf?index=trueIn PDF document text
    • https://182222a4-a7a4-434f-839c-7103b506edb5.filesusr.com/ugd/224a67_7b3533fccf2e41a79bc96cfd206b0fef.pdf?index=trueIn 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_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 5220 bytes
SHA-256: 11a1b53dc566df18b1acf919c7a1b074ac84fade4dc21fd4334982c22f982445
font_01_sfnt_off00011eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFF 12068 bytes
SHA-256: 4afa111a07e762f34b715d4602d3e433dc5e40348ace1d543ba1457dffe8cd3a