Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93d1da45d079aaf…

MALICIOUS

PDF

77.5 KB Created: 2021-03-19 20:42:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b7bf126a79d6b1f8954297bd63d867be SHA-1: 5550e94c14612f9f0f280675d88964567b394995 SHA-256: d93d1da45d079aaf1716d59c38946942a3744bd965d5bf1fdba5b6f040bd6660
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 0.9997

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://jumiwimov.ru/wix?keyword=tech+utilities+license+key+free PDF link annotation
    • http://vvinorama.fun/fesaxizinekexomidumekim7stt.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/atualizar_boleto_santander.pdfIn PDF document text
    • http://fb-ig-violation.com/motanuragibezokoduluza8mduj.pdfIn PDF document text
    • http://dom-bita.org/249771129542389h.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/14404613334.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495551/normal_6000562538fae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473656/normal_5fe645d09d4b2.pdfIn PDF document text
    • http://bepelisufozasep.mywebcommunity.org/fedex_express_freight_us_airbill.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384460/normal_604ec974cb09a.pdfIn PDF document text
    • http://tb-films.ru/lawiregilozizajufei03r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_b6bdefd579b749ca8b2a2d64f720d7b2.pdf?index=trueIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_0de06848c14445458fe9d4333fee774f.pdf?index=trueIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_5c9cd2f9c9c740a69fe1871997a796cd.pdf?index=trueIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_d05dbe92eea04e89bdf684ecc5da2efe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/copper_leaf_sheets.pdfIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_ee617c81bc9245a18e08be30b1862bef.pdf?index=trueIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_494e74439a8f4e5a93d3b17bfc0b6696.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/15956378966.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_599dbb9ec48447c2a7b458c2e8b6ad05.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/why_is_my_brother_printer_suddenly_offline.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_5794771e9ead4e5f8a313dc37027497f.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_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 4876 bytes
SHA-256: a4fb55ceffaeeed34be21468ac511692bc6720dc7773063b730935064680bdb0
font_01_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 11308 bytes
SHA-256: a983a5f39ee7374cba084edbacc6f575927e17c96e81797ade76042f7395d35f